Over a period of time, depending on how much you use your computer, it will gather necessary and unnecessary data, storing it deep within your systems Registry. The Registry is usually larger than required simply because it retains a wealth of out-of-date information regarding removed files and applications; this information often accumulates and will ultimately result in your PC processing Registry information more slowly. In more extreme cases, this information will increase the time it takes your computer to boot. 29 Oct 2008