|Simply contact the administrator and talk to him about your problem.|
The virus scanning process should normally be configured to scan files on access.
A complete harddisk virus scan should be configured to run during lunchtime.
Simply stopping antivirus isn't really an option, because it's only a matter of time, that your pc will get infected. And you'll get lucky if only your pc will get infected !!!
And this is the time, were you really can't work anymore.
So simply ask the admin for that.
Please send a reply, if you solved the problem !!!