CCleaner (drive cleaner)
CCleaner (a.k.a. Crap Cleaner) is a hugely helpful tool for deleting all of the crap that you don’t need. It will clear out all of the regular crap that builds up in Windows as well as the crap that builds up in various applications that you may have installed. It has an excellent registry cleaner that will clear all of the crap registry entries that build up over time. And it give’s you tools for even more advanced maintenance.