I was online this morning when all of a sudden, all of my windows closed and my PC shut itself down. When I restarted, it took forever for everything to start back up. I also noticed that there was a search window added to my browser (like you get if you click on one of those stupid "set this as my home page" pop-up buttons. Since then, my PC runs super slow upon startup.
I ran a virus scan and cleaned out all my spyware, but nothing seems to fix it. Any ideas?