A system restore might work, but more than likely will fail. I recommend just to start with a fresh windows install. If you have an Ubuntu disk, run it in the live move and backup any files you need to an online storage site or an external hard drive. The best way to clear it up is to just re install windows, you can even try to just reinstall on the previous partition that way you can still access your files. They should be in C:WindowsWindowsOld (something like that) you can find your documents, pictures music in there. once you have your music and important files out it is safe to delete the WindowsOld folder.
If that's too confusing if a system restore fails just reformat your hard drive and re install windows. Hope it helps you some what man

sorry, about the crash hope you don't loose any important files like I have before! Good luck