Disable "Virus Scan" in Excel

Source: Tech Guy

After so many months of trouble-shooting it, I think I finally found the reason why my Excel keeps hanging. Sighz don't know if I should attribute it to Vista problematic nature.. Anyway I read that usually is the Norton Security Scan that is handling the office scan. Finally found in this post that AVG also has a office scan...

The dll in-charge of the office scan is avgoff2k.dll

To un-register it:
regsvr32.exe /u "(path)avgoff2k.dll" where (path) refers to the directory that stores the dll

To register it again:
regsvr32.exe "(path)avgoff2k.dll"