All I can say those problems are not LFS-related, unless you downloaded the patch at some crap site with a virus in it. You should try to boot from a boot CD that contains a backup program, and make a backup of the whole partition where windows is installed. Then, you should use a boot CD that has an Anti Virus Program, and scan your drives from there.
If you dont have such a CD, well.... I dont know what features Norton provides, but if you have bought it, it should be possible to have a boot CD in the package.
If you have no clue about booting from a CD, you should ask a friend or some specialist, but those are quite expensive I guess :s
OT: Norton sucks, DriveImage and Acronis ftw
ok, the windows restore sucks even more than Norton