malware bytes is a joke as the scanner window disappears soon after you start the scan and trying to restart brings up an error message. It has never worked right for me
No joke, it is one of the better anti-malwares out there and disappearing/not running isn't normal and more likely to be some other influence as has been mentioned. This could possibly be a rootkit.
What are the error messages that you get when trying to restart it ?
You could also try running MBAM from safe mode and see if that makes any difference. I believe there is also a way to run MBAM using a random file name so that the executable isn't initially recognised, though I have never had to do this.