awc.dll error / : APPCRASH Application Name: bf3.exe Application Version:1.6.0.0 Application Timestamp: 511c9356 Fault Module Name:awc.dll

what causes this error and how can it be fixed .This has canned my bf3 now for 8 weeks ,

it will not start it just crashes .Have done a complete uninstall and reinstall to no avail,

please help it,s driving me nuts.