Boot files\C:\windows\system32\cannot be read

I have been reading these forums for an answer to my problem for two days OS Windows XP Pro. Major problems with folders which have hidden attributes and C: not working correctly. I have run antivirus, regcure, registry smart, error killer etc. and no change.

The original error message was C: program~1\common~1\symantec~1\virusd~1\20061103.019 Corrupt and unreadable. Symantec AntiVirus runs at start up.

Can't run things from start like the help and support, add/remove, etc.

PLEASE HELP!!
Antiquer