>>>after 40 minutes of scanning I wasn't offered the buttons you name
Well you must have the only computer in the country without some sort of malware lurking in it! (I've never known anyone do a scan and not find anything!).
You should have been presented with a screen like this one:
http://r23.imgfast.net/users/2315/89/79/54/album/mbam110.png
Clicking on 'Show Results' should then take you to something like this:
http://www.removethisvirus.com/wp-content/uploads/2013/11/remove-xaven-malwarebytes.png
You then need to put a tick against everything there. (If there's a lot, click on the first item to highlight it, then right-click and select 'Check all'). Then click on 'Remove Selected'.
It might be worth another try!