c4.exe Application Error

I was practicing last night in the FWD fun4all server and after finishing and exiting back to my desktop I had a Windows Error Message stating "The Exception Illegal Instrument, An attempt was made to execute an Illegal Instrument (0xc000001d) occured in the application at location '0x5ad7a3'" after clearing the message another Message occured Stating "Account Violationin application 5ad7a28c in module uxtheme.dll - Read of address FF36FF10 -"
This whole thing has confused me and I would love to know what to do about it. Can anyone help?

:stupid2: