I have an HP with a divided hard drive (forgot the term). Anyway, I was recently suffering some kind of worm which my antivir program couldn't even solve. Eventually the system locked down and was not functunal. They are now disabling the protection.
Anyway I was able to restore the complete system by selecting "restore" on booting with the program that came with the system. It takes a while but was well worth it. I was amazed and congradulate HP.
The only small problem is that it rewrites windows and critical files. Games and stuff will not have the ini file in windows. No big deal really, compared to trying to get rid of the malware.