With 2012 about to hit, why not give you computer a clean-up.
One of the best bits of software around is Glary Utilities, just download the free version, install and run, and do the one button scan and clean. Restart your computer and it will often start-up faster and run faster. I have been using it for years and its been discussed a few times on AP, but thought a fresh start for 2012 meant it was worth mentioning again