[fowlplay4]

Running more than one Anti-virus is just asking for trouble, and performance degradation especially if it has some sort of nosey firewall module (assuming you're using the Suite version, it does).

I personally only use MS Security Essentials, and only have loading problems with Graal since it decides to scan it for whatever reason.

I'd recommend uninstalling/removing BitDefender completely and just use MS Security Essentials alone as it is pretty solid.