Oh my, what a mess. From your post I think I was able to gather that you can no longer start your computer without some sort of scan running? Please correct me if I'm wrong.
First of all, I advise you never to use scanners and "magical-fairy-super-speed-up-PC" crap from the internet. Half the anti-virus etc programs out there are actually just blatant advertisement programs, with many telling you that you have a virus when in-fact you don't, or you do, but only because the "scanner" program installed it itself and then offers to remove it at a cost to your visa.
Any way enough ranting. Try to organize your post down to just what happened, what you have tried and what still works.
Can you create a Hijackthis log?