Seems like few of them have the same issue. The reason is because the Driver
Verifier detected an Violation on DRIVER_BIN64.sys
which ATI Tray Driver. You could Turn Off Driver Verifier in case you have enabled it. Start | Run | Verifier | there select Delete exisitng settings
and click Finish
. In few forums DRIVER_BIN64 is reported as it's not signature verified. Or just disable ATI Tray from the Startup. then see if you have the same problem.