el,
You may find that the virus damaged your operating system.
Just because you get rid of the virus, does NOT mean that the Operating System was repaired.
You can try doing a system restore, personally I find that only works 50% or less of the time does that work.
REMEMBER!!!!!!!, "IF" you do a restore, make sure to look to see if the virus is still there in the restore.
"IF" you have a Operating System disk NOT!!!! a restore disk, you can try check disk to help.
Start>Programs>Accessories>Command Prompt.
Type"chk dsk /f/r"
Hit enter and answer yes to check next time you reboot.
Yep, you guessed it, reboot.
Have your Operating Disk handy as it may need it to get "non-corrupted" files to replace the damaged ones.
Let me know how it works out for you.