The only process of any significance was this one which was removed by Mbam:
Registry Keys Infected:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\gaopdxserv.sys (Trojan.Agent) -> Quarantined and deleted successfully.
gaopdxserv.sys is considered to be a Rootkit. Hidden files show be shown and Rootrepeal run. However, I didn't suggest it because:
I feel, personally that only a Hijackthis log is useful, as the scans can be done by the users wishes.
and took issue with the additional scans.
It appears there are 5 users on the system and you have given very little specific information. I suggest you check the Event Log for any Errors that correspond to the time of the freezes.
The thread subject is: "Explorer.exe freezes computer." The path you gave is "start --> My Computer and my computer freezes for 10-5 seconds.."
This tells me nothing.
1. Is there any error message? If so, what?
2. Does the function proceed after the 5-10 second freeze?
3. What feature are you trying to access in My Computer?
4. Have you tried doing a right click on Start> Explore?
5. Is the problem only with opening the antivirus program? You have a full Norton suite. Do the other parts of it work?
6. Have you tried launching the program from All Programs?
7. an you update the program?