Thank you exile360 - it's cleared up this morning - I logged onto my computer and it was up on the desktop
I was notified to update the free version of malwarebytes this afternoon and after it updated and I closed out the computer. When I got back on a few minutes ago it had totally disappeared from my computer. It's not pinned to startup (first thing I noticed) not on start menu, when I went to control panel and checked programs not there either. What happened during this update? What do I need to do? Thank you.