A major problem is that a windows xp registry cleaner comes with spyware or adware that users are not able to detect. These spywares benefits registry cleaner vendors and degrades the performance of our own computer performance. I do recommend that before deciding which registry cleaner to download, make sure that the vendor of the registry cleaner is trustworthy. Hope this article assisted you on answering "What is registry", and also made you aware on how to make your computer functioning with the same performance as you bought if first time. Certainly, by keeping your registry up to date you will be able to utilize your computer with top performance. Shahzad Khan is an ebusiness Specialist, with computer science background. He loves internet security and likes to spread computer security awareness to all the computer users.