Malwarebytes and Spybot are not antivrus so you can have both those running. For the start menu you can try this:
Go to start>run and copy/paste whats below in the Run window, click ok or enter. Reboot your computer and see if that helped.
regsvr32 /i shell32.dll
Go to start>run and copy/paste whats below in the Run window, click ok or enter. Reboot your computer and see if that helped.
regsvr32 /i shell32.dll