Latest bugcheck is a SYSTEM_SERVICE_EXCEPTION (3b) with nvlddmkm.sys being flagged. Sure, go ahead and go up to the latest version again (or try a beta if available if you have not already). If it's of any consolation, I wouldn't recommend constant Driver Sweeper. That may actually be causing the issue. Have you tried simply uninstalling the video driver and then clean installing a new version without the use of Driver Sweeper in between?
Regards,
Patrick
