One of my favourite tools for keeping Windows running fast and smooth is CCleaner from Piriform. It’s a quick, reliable way to steam clean your hard drive and the Windows registry. Over time, both fill up with outdated, corrupt or redundant files and entries. CCleaner scans both and removes all of the stuff that’s slowing things down and wasting space.
The free version is so great, I recommend buying the full version just to keep Piriform in business, doing what they do.