Apologies if I'm in the wrong forum.  I've recently started playing sims 3 again and downloaded one wallpaper over the weekend that I suspected may have had something attached, but as yet I can't find it.  I've looked with MSE, Malwarebytes,
Emsisoft and am running Eset at the moment.  Nothing is showing up.  This morning playing a flash game I suddenly
couldn't scroll with the mouse and had to close Firefox and reopen to get the page to work.  

I've had to remove the latest Adobe 11.3 plugin because it's crap and go back to Adobe 10.  Could that be the problem?

Also, I want to know the best antivirus/malware program to buy.  I need something solid.  I have tried Kaspersky, the temporary one, but it slowed down my computer.

Thanks.