People wrongly assume that getting rid of a virus will automatically put things back the way they were, unfortunately this is often not the case. If the virus put triggers in the start-up then even after it is gone you get start-up errors, or worse, it's not really gone and a backup restarts the malware. If it changed or moved any files, they stay changed/moved unless you locate and fix them. And if it deleted files, they may be gone completely. And if it messed up your registry, then your registry stays messed up unless you have a way to restore it. Viruses are nasty pieces of code from very nasty little people.
So it sounds like your registry may have been damaged; the registry includes your personalized settings, for example your library pointers. I suggest you go to System Restore. If it recommends a restore point, choose pick another (it may skip this screen). Once at the list of restore points check the box to "show more". If you are lucky, you will have restore points, however some nasty viruses actually delete all your restore points. So if you have any, pick a date prior to all the problems and allow it to restore. If things are back to normal after the restore then great. If not, then try an older restore point.
If you have success restoring your system, then run yet another virus scan. But if you run out of restore points or don't have any, then my best recommendation is to back up all your files you found, to a flash drive or external harddrive, gather your W7 product key and any additional software you use, and then completely reinstall W7.