any chance you have a Logitech Mouse with the extra software installed?
http://support.microsoft.com/kb/810980_______________________________________________
The Error Message that you posted:
Stop 0x000000D1 or DRIVER_IRQL_NOT_LESS_OR_EQUAL
The Stop 0xD1 messages indicates that the system attempted to access pageable memory using a kernel process IRQL that was too high. Drivers that have used improper addresses typically cause this error.
Possible Resolutions:
* Stop 0xD1 messages can occur after installing faulty drivers or system services. If a driver is listed by name, disable, remove, or roll back that driver to confirm that this resolves the error. If so, contact the manufacturer about a possible update. Using updated software is especially important for backup programs, multimedia applications, antivirus scanners, DVD playback, and CD mastering tools.
above is courtesy of: Marc Lironhttp://www.updatexp.com/stop-messages.html
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From the Stop Error message....
1. You may have a corrupted Device Driver <--- Please Check in Device Manager (if found, Remove and Reboot to allow Windows to "find new hardware" and "install drivers for new hardware"
2. You may have an installation of the game gone bad. <-- Uninstall and reinstall
3. You may have acquired a Malware Infection <-- please run HJT and post your Log in Malware Removal Forum
Please keep us posted with your progress.
If you Post into the Malware Removal Forum, please complete that work, before returning to post here for additional assistance as needed.
Best Regards