Hi Wainism
If you know the worm / virus type, just download the "cure" from Sysmatec
website (download to diskette using other PC)
"Run" the diskette on your this infected PC
"Restart" your PC
"Run" your Norton antivirus again
It should be alright
If the problem persists, call Symantec at : 1800-720-7898 (toll free)
They are quite helpful and skillful to help you "remove the worm"
Good luck !