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Do you have the patch installed?

Also

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.
4) Update your Windows, update your Video card drivers and audio card drivers. Then repeat steps 1-3.