I was having windows error messages popup everytime I opened an executable or anything in internet explorer (it would go to my homepage but close on every link). I could not even open virusscan without getting some kind of error. I read up online and learned SFC /SCANNOW might work. I did that an it looked like everything went well. I tried opening applications and browsing the internet again and this time I was not getting error messages. I restarted my computer but now I get to the black Microsoft Windows XP screen and it just freezes. I cannot boot to last good configuration or safe mood. I disabled restart on system failure and tried restarting again and I got to a blue screen saying "A problem has been detected and windows has been shut down to prevent damage to your computer. PAGE_FAULT_IN_NONPAGED_AREA" I'm assuming this was because of SFC... Any ideas how to fix this?
Also, remove any unnecssary hardware, including network cable, and see if that helps.
I suspect you'll need to do a repair install at the very least:
http://support.microsoft.com/kb/315341/
http://www.michaelstevenstech.com/XPrepairinstall.htm
If you have valuable files on that disk that you can't afford to lose, then consider backing them up first, either by connecting your disk to another PC as a slave disk, or by booting from something like the Ultimate Boot CD (http://www.ubcd4win.com/)
I am guessing a bit, but next time it is better to fix the virus problem first, before running sfc /scannow