Wow. All 5, eh?
Well.... I am having a recurring issue with a backdoor.bot that the free version of Malwarebytes finds, and quarantines....but it still keeps coming back. I have removed anything and everything from that pc (I have another working one (Dell) that I use for financial stuff)....that hackers might want or could use. It's just for surfing the net and games now. But it still annoys the hell out of me whenever it shows back up in my "Start-up" folder. Grrr....
Malwarebytes is a great tool, and I use it all the time. But if you think it takes the place of a true anti-virus, You've another think coming. Malwarebytes is rigged for anti-spyware, and while it is damn good at that, it is less usefull against classic viral attacks.
I'll tell you what. Go get Sophos free home product (good for 10 machines I think) and let it have at it. I think your trouble will be gone. If not, PM me and we'll git er done.
https://home.sophos.com/