I was using Windows 2000 inside Qemu to test some .NET samples and it hanged all my computer. I don't know what happended because other times it worked very good. The worst is that when I restarted my system and tried to run Widnows again, it doesn't worked. I tried to repair it with the install CD but I couldn't. Now I'm reinstalling all (windows, .NET and Visual C#) and it's a lot of wasted time :(. From now I'll use "-snapshot" option in Qemu to prevent the changes in the main image file (can still commit changes using Qemu console).