Ah yes, the ads problem. I've dealt with these before.

Some of the ways you can remove them is the easiest way, by going to Control Panel, then Uninstall Programs. Find the toolbar or the name of the ad thing, and click uninstall. Once that is done, I recommend to restart your computer.

If that doesn't work, then I would suggest updating and running MalwareBytes (I think you had said you had done that.)

IF that doesn't work, then I would go to ComboFix. ****This should be the last resort, and all you do is follow the simple instructions. I've done and it does perfectly work for me. I would recommend while running this program to turn your antivirus off if you have one.

The best antivirus program I would recommend is AVG or Windows Security Essentials. AVG does drag your computer down somewhat, but it gets the job done. But out of the two I recommend what I use and that's Windows Security Essentials. Very easy to use and doesn't slow your computer down as AVG does.

Hope this helps.