Qubes OS is a reasonable way of running Windows VM's. You install a template VM with Windows 7, and the only thing you run in that VM is Windows Update to make

Qubes OS is a reasonable way of running Windows VM's. You install a template VM with Windows 7, and the only thing you run in that VM is Windows Update to make sure it's up to date. Your actual Windows work is run in AppVM's which are based on the template. Any changes in an AppVM is rolled back every time it's restarted (it's always based on the template), with the exception on the user's home directory. For anyone that hasn't used Qubes OS, this is how you do most work in it, even for the Linux VM's, and I like how it allows you to be in better control of what is actually running on your system. Using Qubes OS take a bit more effort, but once you get everything up and running the way you want it, you'll be asking yourself why not all operating systems do this.