If your computer is running a bit slow and you have checked everything else, you might want to delete your prefetch files.  I'm not really sure what they are but I believe they are files that are stored for Internet Explorer so they can load faster, but it just slows your computers down.  Don't worry no computer operations will be affected.  :)  Just open up your windows explore, and navagate to C:\WINDOWS\Prefetch then delete the files in that folder.  You should notice your computer running alot faster right away.