What can i do to fix my slow computer?

KorniChi asked:


After downloading IMVU, my computer started running very slow. After a while, i deleted it from my computer, and my computer is running slower and worse than ever. Things keep installing themselves, and at random times things from internet explorer like advertisements keep popping up. It freezes very often as well. I’ve tried deleting things that arent necessary on my computer, and its only improved a little bit. What can i do to fix this my computer?