[campusspecialist]

I'm running Symantec coorporate edition10.0 and have one computer that seems to have 'frozen' on a day, while the rest of the clients are fine. I can run a manual live update, yet the definitions version does not change. Also, when attempting to run a full scan, it says it completes with success, without actually scanning any files.
Here's what I've tried so far....
Took off system restore, booted into safe mode, confirmed registry entries from most previously detected (weeks before frozen state) trojan were clean. Attempted to run live update(when safe mode w/networking), tried running scan, repaired symantec, reload (without complete removal first), loaded separate AVG A/V, ran spybot SD, compared symantec folders with another properly running computer.
With these steps, I was only able to get the symantec scan to run and not find anything. AVG found 1 spyware, spybot found numerous entries. After this, still unable to update or scan when booting normally.
Everything appears to be safe, but is it, and what else can I try before I manually un-install and start from scractch (which only may possibly work?)?

[lunarlander]

Some malware are known to disable onboard antivirus. In the sticky 'Security Help Tools' (near the top of all messages ) there is a list of online scanners. Try them and see if they detect anything.