由于windows不包含VirtIO驱动，PVE默认使用ide硬盘很卡，在新建虚拟机时将硬盘ide调整为scsi，额外新建一个cd驱动器挂载virtio-win iso，然后在windows安装界面加载挂载的驱动，windows7最新可用版本为virtio-win-0.1.173。
windows7安装完成后设备管理器有一未识别设备，下载windows6.x-hypervintegrationservices-x64管理员运行powershell安装。
Dism /online /Add-Package /PackagePath:C:\windows6.x-hypervintegrationservices-x64.cab参考：
https://forum.proxmox.com/threads/unknown-device-in-win7-vm.49698/
https://forum.proxmox.com/threads/windows-7-and-virtio-drivers-no-signed-drivers-found-for-0-1-185-and-0-1-190-or-bsod-with-0-1-189.79708/
https://pve.proxmox.com/wiki/Paravirtualized_Block_Drivers_for_Windows
https://pve.proxmox.com/wiki/Windows_7_guest_best_practices
https://pve.proxmox.com/wiki/Windows_VirtIO_Drivers