This is what has always amazed me about the Windows world. People just accept the fact that you need to do these "restores" or re-install Windows on a regular basis. Back when XP was the current version it was sort of a running joke that "you need to re-install Windows" was the standard advice for anything wrong with your system.
Hey, I'm a pragmatist, so if that's what you need to do in order to get your work done then why not? But it's sad that people expect such a low level of reliability/quality in a computer operating system. This kind of thing has certainly never been the norm on the Mac. And, as I said, it has not been the norm for me with Windows either. But my use of Windows is limited to a small group of GIS programs.
BTW, my old MacBook Pro was setup as a dual-boot machine that could startup in either Windows XP or MacOSX. A few days ago I deleted the Windows partition on that machine since I no longer use it and don't want to keep renewing the anti-virus software. I'm in the process of ripping my collection of movies on DVD and the free space was more useful to me than Windows.
So I no longer have an XP machine now. Good riddance!