another possibility is I've heard that usb devices can sometimes interfere with windows directx. you might try moving the bt dongle to a different usb port. also remove any other usb devices, except kybd/mouse, just to test.
can you also post the following plz:
Start > Run
Dxdiag
Click the 'Save All' button
File is saved to the desktop as "DxDiag.txt"
Copy/paste the information (up to, and including, the [PS/2 Devices] section) to the forum. The information might have to be separated into multiple posts due to the maximum character limitation.
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