Your computer has been severely infected by malware, that is BYTEDEFENDER.EXE. This is quite dangerous and unsafe for your PC and there may be other infections on your PC. You should urgently check your PC and remove any malicious application including BYTEDEFENDER.EXE infected registry entries as soon as possible.

Location : %ProgramFiles%\ByteDefender Software\ByteDefender\ByteDefender.exe
Type : Malware
Dangerous : YES
Removal : Immediately

 
How to get rid of BYTEDEFENDER.EXE file / Error message