Bad Image Error & Constant Notifications

Hi, I've started receiving Bad Image error messages on startup for a few unimportant programs (YouCam). I also received the error messages for Firefox, preventing me from using it. I tried uninstalling and re-installing, Bullguard scan, Malwarebytes Scan, SFC /scannow and System Restore all of which did not work. I also tried ADWcleaner and Disk Check, one of these worked and I can now use...