diff --git a/artiq-fast.nix b/artiq-fast.nix
index 2a0b507..0ccd430 100644
--- a/artiq-fast.nix
+++ b/artiq-fast.nix
@@ -42,9 +42,7 @@ let
   artiqVersion = import "${generatedNix}/pkgs/artiq-version.nix" (with pkgs; { inherit stdenv fetchgit git; });
   windowsRunner = overrides:
     import "${generatedNix}/windows/run-test.nix" ({
-      inherit pkgs;
-      sipycoPkg = artiqpkgs.conda-sipyco;
-      artiqPkg = artiqpkgs.conda-artiq;
+      inherit pkgs artiqpkgs;
     } // overrides);
   jobs = (builtins.mapAttrs (key: value: pkgs.lib.hydraJob value) artiqpkgs);
 in
@@ -61,7 +59,7 @@ in
       buildInputs = [ (windowsRunner {}) ];
       phases = [ "buildPhase" ];
       buildPhase = ''
-        ${windowsRunner {}}/bin/run.sh
+        ${windowsRunner {}}/bin/wfvm-run-windows-tests
         touch $out
       '';
     };
@@ -119,7 +117,7 @@ in
         export ARTIQ_LOW_LATENCY=1
         python -m unittest discover -v artiq.test.coredevice
 
-        ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&python -m unittest discover -v artiq.test.coredevice"; }}/bin/run.sh
+        ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\Anaconda3\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&& python -m unittest discover -v artiq.test.coredevice"; }}/bin/wfvm-run-windows-tests
       )
 
       mkdir $out
diff --git a/artiq-fast/windows/README.md b/artiq-fast/windows/README.md
deleted file mode 100644
index 279e967..0000000
--- a/artiq-fast/windows/README.md
+++ /dev/null
@@ -1,25 +0,0 @@
-# Preparation steps
-
-## Install a Windows image
-
-```shell
-nix-build install.nix -I artiqSrc=…/artiq
-result/bin/windows-installer.sh
-```
-
-Follow the instructions.
-
-## Install Anaconda to the image
-
-```shell
-result/bin/anaconda-installer.sh
-```
-
-Move the image `c.img` to one of Nix' `extra-sandbox-paths` (`nix.sandboxPaths` on NixOS).
-
-
-# Running the tests manually
-
-```shell
-nix-build --pure --arg diskImage "\"…/c.img\"" -I artiqSrc=…/artiq manual-test-run.nix
-```
diff --git a/artiq-fast/windows/install.nix b/artiq-fast/windows/install.nix
deleted file mode 100644
index 9ac5e7a..0000000
--- a/artiq-fast/windows/install.nix
+++ /dev/null
@@ -1,91 +0,0 @@
-{ pkgs ? import <nixpkgs> {},
-  diskImageSize ? "22G",
-  qemuMem ? "4G",
-}:
-
-with pkgs;
-
-let
-  windowsIso = fetchurl {
-    url = "https://software-download.microsoft.com/download/sg/17763.107.101029-1455.rs5_release_svc_refresh_CLIENT_LTSC_EVAL_x64FRE_en-us.iso";
-    sha256 = "668fe1af70c2f7416328aee3a0bb066b12dc6bbd2576f40f812b95741e18bc3a";
-  };
-  anaconda = fetchurl {
-    url = "https://repo.anaconda.com/archive/Anaconda3-2019.03-Windows-x86_64.exe";
-    sha256 = "1f9icm5rwab6l1f23a70dw0qixzrl62wbglimip82h4zhxlh3jfj";
-  };
-
-  escape = builtins.replaceStrings [ "\\" ] [ "\\\\" ];
-  qemu = import ./qemu.nix {
-    inherit pkgs qemuMem;
-    diskImage = "c.img";
-  };
-  # Double-escape because we produce a script from a shell heredoc
-  ssh = cmd: qemu.ssh (escape cmd);
-  scp = qemu.scp;
-
-  sshCondaEnv = cmd: ssh "anaconda\\scripts\\activate && ${cmd}";
-  condaEnv = "artiq-env";
-  condaDepSpecs =
-    builtins.concatStringsSep " "
-    (map (s: "\"${s}\"")
-     (import ../conda/artiq-deps.nix));
-
-  instructions =
-    builtins.toFile "install.txt"
-    (builtins.readFile ./install.txt);
-in
-stdenv.mkDerivation {
-  name = "windows-installer";
-  src = windowsIso;
-  setSourceRoot = "sourceRoot=`pwd`";
-  unpackCmd = ''
-    ln -s $curSrc windows.iso
-  '';
-  propagatedBuildInputs = qemu.inputs;
-  dontBuild = true;
-  installPhase = ''
-    mkdir -p $out/bin $out/data
-    ln -s $(readlink windows.iso) $out/data/windows.iso
-    cat > $out/bin/windows-installer.sh << EOF
-    #!/usr/bin/env bash
-    set -e -m
-
-    ${qemu.qemu-img} create -f qcow2 c.img ${diskImageSize}
-    ${qemu.runQemu false [] [
-      "-boot" "order=d"
-      "-drive" "file=c.img,index=0,media=disk,cache=unsafe"
-      "-drive" "file=$out/data/windows.iso,index=1,media=cdrom,cache=unsafe"
-    ]} &
-    cat ${instructions}
-    wait
-    EOF
-
-    cat > $out/bin/anaconda-installer.sh << EOF
-    #!/usr/bin/env bash
-    set -e -m
-
-    ${qemu.runQemu false [] [
-      "-boot" "order=c"
-      "-drive" "file=c.img,index=0,media=disk"
-    ]} &
-    sleep 10
-    ${ssh "ver"}
-
-    ${scp anaconda "Anaconda.exe"}
-    ${ssh "start /wait \"\" Anaconda.exe /S /D=%cd%\\anaconda"}
-
-    ${sshCondaEnv "conda config --add channels conda-forge"}
-    ${sshCondaEnv "conda config --add channels m-labs"}
-    ( ${sshCondaEnv "conda update -y conda"} ) || true
-    ${sshCondaEnv "conda update -y --all"}
-    ${sshCondaEnv "conda create -y -n ${condaEnv}"}
-    ${sshCondaEnv "conda install -y -n ${condaEnv} ${condaDepSpecs}"}
-    ${ssh "shutdown /p /f"}
-
-    echo "Waiting for qemu exit"
-    wait
-    EOF
-    chmod a+x $out/bin/*.sh
-  '';
-}
diff --git a/artiq-fast/windows/install.txt b/artiq-fast/windows/install.txt
deleted file mode 100644
index a2576c1..0000000
--- a/artiq-fast/windows/install.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-Add user account with expected password [user/user].
-Enable the OpenSSH server:
-- "Add or remove programs"
-- "Manage optional features"
-- "Add a feature"
-- "OpenSSH Server"
-- "Install"
-- Open "Services"
-- Double-click the "OpenSSH SSH Server" service
-- Set "Startup type" to "Automatic"
-- "Start"
-- "Ok"
-Then press ENTER here to proceed with automatic installation
diff --git a/artiq-fast/windows/manual-test-run.nix b/artiq-fast/windows/manual-test-run.nix
index b04ae8d..fd4d554 100644
--- a/artiq-fast/windows/manual-test-run.nix
+++ b/artiq-fast/windows/manual-test-run.nix
@@ -1,30 +1,10 @@
-# This runs `run-test.nix` with `nix-build`
-
-{ pkgs ? import <nixpkgs> {},
-  artiqpkgs ? import ../. { inherit pkgs; },
-  diskImage ? "/opt/windows/c.img",
-  qemuMem ? "2G",
-  testTimeout ? 180,
-}:
-
-with pkgs;
+{ pkgs ? import <nixpkgs> {} }:
 
 let
-  windowsRunner = overrides:
-    import ./run-test.nix ({
-      inherit pkgs diskImage qemuMem testTimeout;
-      sipycoPkg = artiqpkgs.conda-sipyco;
-      artiqPkg = artiqpkgs.conda-artiq;
-    } // overrides);
+  artiqpkgs = import ../. { inherit pkgs; };
+  run-test = import ./run-test.nix {
+    inherit pkgs artiqpkgs;
+    testCommand = "set ARTIQ_ROOT=%cd%\\Anaconda3\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&& python -m unittest discover -v sipyco.test && python -m unittest discover -v artiq.test";
+  };
 in
-
-stdenv.mkDerivation {
-  name = "windows-test";
-
-  phases = [ "installPhase" "checkPhase" ];
-  installPhase = "touch $out";
-  doCheck = true;
-  checkPhase = ''
-    ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&python -m unittest discover -v artiq.test"; }}/bin/run.sh
-  '';
-}
+  run-test
diff --git a/artiq-fast/windows/qemu.nix b/artiq-fast/windows/qemu.nix
deleted file mode 100644
index e575f0d..0000000
--- a/artiq-fast/windows/qemu.nix
+++ /dev/null
@@ -1,55 +0,0 @@
-{ pkgs,
-  diskImage,
-  qemuMem,
-  sshUser ? "user",
-  sshPassword ? "user",
-}:
-
-with pkgs;
-
-let
-  qemu-img = "${qemu_kvm}/bin/qemu-img";
-  runQemu = isolateNetwork: forwardedPorts: extraArgs:
-    let
-      restrict =
-        if isolateNetwork
-        then "on"
-        else "off";
-      # use socat instead of `tcp:…` to allow multiple connections
-      guestfwds =
-        builtins.concatStringsSep ""
-        (map ({ listenAddr, targetAddr, port }:
-          ",guestfwd=tcp:${listenAddr}:${toString port}-cmd:${socat}/bin/socat\\ -\\ tcp:${targetAddr}:${toString port}"
-        ) forwardedPorts);
-      args = [
-        "-enable-kvm"
-        "-m" qemuMem
-        "-bios" "${OVMF.fd}/FV/OVMF.fd"
-        "-netdev" "user,id=n1,net=192.168.1.0/24,restrict=${restrict},hostfwd=tcp::2022-:22${guestfwds}"
-        "-device" "e1000,netdev=n1"
-      ];
-      argStr = builtins.concatStringsSep " " (args ++ extraArgs);
-    in "${qemu_kvm}/bin/qemu-system-x86_64 ${argStr}";
-
-  # Pass empty config file to prevent ssh from failing to create ~/.ssh
-  sshOpts = "-F /dev/null -o StrictHostKeyChecking=accept-new -o UserKnownHostsFile=\$TMP/known_hosts";
-  sshWithQuotes = quotes: cmd: ''
-    echo ssh windows ${quotes}${cmd}${quotes}
-    ${sshpass}/bin/sshpass -p${sshPassword} -- \
-      ${openssh}/bin/ssh  -np 2022 ${sshOpts} \
-      ${sshUser}@localhost \
-      ${quotes}${cmd}${quotes}
-  '';
-  ssh = sshWithQuotes "'";
-  scp = src: target: ''
-    echo "Copy ${src} to ${target}"
-    ${sshpass}/bin/sshpass -p${sshPassword} -- \
-      ${openssh}/bin/scp -P 2022 ${sshOpts} \
-      "${src}" "${sshUser}@localhost:${target}"
-  '';
-  
-in
-{
-  inherit qemu-img runQemu ssh sshWithQuotes scp;
-  inputs = [ qemu_kvm openssh sshpass ];
-}
diff --git a/artiq-fast/windows/run-test.nix b/artiq-fast/windows/run-test.nix
index 6293d2e..369af35 100644
--- a/artiq-fast/windows/run-test.nix
+++ b/artiq-fast/windows/run-test.nix
@@ -1,24 +1,6 @@
-{ pkgs,
-  sipycoPkg,
-  artiqPkg,
-  diskImage ? "/opt/windows/c.img",
-  qemuMem ? "2G",
-  testTimeout ? 600,
-  testCommand ? "python -m unittest discover -v sipyco.test && python -m unittest discover -v artiq.test",
-}:
-
-with pkgs;
+{ pkgs, artiqpkgs, testCommand }:
 
 let
-  escape = builtins.replaceStrings [ "\\" ] [ "\\\\" ];
-  qemu = import ./qemu.nix {
-    inherit pkgs qemuMem;
-    diskImage = "c.img";
-  };
-  # Double-escape because we produce a script from a shell heredoc
-  ssh = cmd: qemu.ssh (escape cmd);
-  sshUnquoted = qemu.sshWithQuotes "\"";
-  scp = qemu.scp;
   condaEnv = "artiq-env";
   tcpPorts = [ 1380 1381 1382 1383 ];
   forwardedPorts =
@@ -27,58 +9,44 @@ let
       targetAddr = "192.168.1.50";
       inherit port;
     }) tcpPorts;
+
+  wfvm = import ../wfvm/default.nix { inherit pkgs; };
+  conda-deps = {
+    name = "conda-deps";
+    script = let
+      conda-deps-noarch = import ./conda_noarch_packages.nix { inherit pkgs; };
+      conda-deps-win-64 = import ./conda_win-64_packages.nix { inherit pkgs; };
+      conda-packages-put = pkgs.lib.strings.concatStringsSep "\n"
+          ( (map (package: ''win-put ${package} 'fake-channel/noarch' '') conda-deps-noarch)
+             ++ (map (package: ''win-put ${package} 'fake-channel/win-64' '') conda-deps-win-64) );
+    in
+      ''
+      win-exec 'mkdir fake-channel && mkdir fake-channel\noarch && mkdir fake-channel\win-64'
+
+      ${conda-packages-put}
+
+      win-put ${artiqpkgs.conda-windows-binutils-or1k}/win-64/*.tar.bz2 'fake-channel/win-64'
+      win-put ${artiqpkgs.conda-windows-llvm-or1k}/win-64/*.tar.bz2 'fake-channel/win-64'
+      win-put ${artiqpkgs.conda-windows-llvmlite-artiq}/win-64/*.tar.bz2 'fake-channel/win-64'
+
+      win-put ${artiqpkgs.conda-pythonparser}/noarch/*.tar.bz2 'fake-channel/noarch'
+      win-put ${artiqpkgs.conda-sipyco}/noarch/*.tar.bz2 'fake-channel/noarch'
+      win-put ${artiqpkgs.conda-quamash}/noarch/*.tar.bz2 'fake-channel/noarch'
+      '';
+  };
 in
+  wfvm.utils.wfvm-run {
+    name = "windows-tests";
+    image = wfvm.makeWindowsImage { installCommands = [ wfvm.layers.anaconda3 conda-deps ]; };
+    inherit forwardedPorts;
+    script =
+      ''
+      ${wfvm.utils.win-put}/bin/win-put ${artiqpkgs.conda-artiq}/noarch/*.tar.bz2 'fake-channel/noarch'
 
-stdenv.mkDerivation {
-  name = "windows-test-runner";
-  src = ./.;
-
-  propagatedBuildInputs = qemu.inputs;
-  dontBuild = true;
-  installPhase = ''
-    mkdir -p $out/bin
-    cat > $out/bin/run.sh << EOF
-    #!/usr/bin/env bash
-    set -e -m
-
-    # +1 day from last modification of the disk image
-    CLOCK=$(date -Is -d @$(expr $(stat -c %Y ${diskImage}) + 86400))
-    ${qemu.runQemu true forwardedPorts [
-      "-boot" "order=c"
-      "-snapshot"
-      "-drive" "file=${diskImage},index=0,media=disk,cache=unsafe"
-      "-rtc" "base=\\$CLOCK"
-      "-display" "none"
-    ]} &
-
-    echo "Wait for Windows to boot"
-    sleep 30
-    ${ssh "ver"}
-    i=0
-    for pkg in ${sipycoPkg}/noarch/sipyco*.tar.bz2 ${artiqPkg}/noarch/artiq*.tar.bz2 ; do
-      ${scp "\\$pkg" "to_install\\$i.tar.bz2"}
-      ${sshUnquoted "anaconda\\scripts\\activate ${condaEnv} && conda install to_install\\$i.tar.bz2"}
-      ((i=i+1))
-    done
-
-    # Schedule a timed shutdown against hanging test runs
-    ${ssh "shutdown -s -t ${toString testTimeout}"}
-
-    FAIL=n
-    ( ${ssh "anaconda\\scripts\\activate ${condaEnv} && ${testCommand}"} ) || FAIL=y
-
-    # Abort timeouted shutdown
-    ${ssh "shutdown -a"}
-    # Power off immediately
-    ${ssh "shutdown -p -f"}
-    wait
-
-    if [ "\$FAIL" = "y" ]; then
-      exit 1
-    else
-      exit 0
-    fi
-    EOF
-    chmod a+x $out/bin/run.sh
-  '';
-}
+      ${wfvm.utils.win-exec}/bin/win-exec ".\Anaconda3\scripts\activate && conda index fake-channel"
+      ${wfvm.utils.win-exec}/bin/win-exec ".\Anaconda3\scripts\activate && conda create -n ${condaEnv} --offline"
+      ${wfvm.utils.win-exec}/bin/win-exec ".\Anaconda3\scripts\activate ${condaEnv} && conda install -y -c file:///C:/users/wfvm/fake-channel --offline artiq"
+      #${pkgs.sshpass}/bin/sshpass -p1234 -- ${pkgs.openssh}/bin/ssh -p 2022 wfvm@localhost -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null
+      ${wfvm.utils.win-exec}/bin/win-exec ".\Anaconda3\scripts\activate ${condaEnv} && ${testCommand}"
+      '';
+  }