My best suggestion would be one of two things.
1. Turn the computer completely off, wait five minutes, and turn it back on. Your computer will update anything that needed fixing, and only does this when you turn it off and back on, just like a cell phone.
2. If you know how, dump the cookies all those websites have put on your computer as you surfed. If you don't know how, find a teenager, they all know...lol!