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Okay let's try some standard things.
1) Rename the AVI folder to AVI_back
2) Set the color depth to 16BIT
3) Turn off everything in the background like E-mail/ICQ/Messenger, Virus protection and everything in the system tray beside the clock.

Was there a change of province ownership recently?
Was this a SP or MP game?
 
Oops, there I go assumeing everyone has the latest patch installed. :)