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You can remove junk files and clean up your system registry for free using ccleaner. http://download.cnet.com/CCleaner/. ccleaner has been around for years and years. You can also get a free copy of Malwarebytes https://www.malwarebytes.org/ to remove spyware and malware from your system. It's another program that has been around for years. Don't believe what you hear or read about these USB sticks protecting Windows XP. Microsoft stopped supporting XP awhile ago and now any unscrupulous group finding security holes within the Operating System are there for intrusions. Windows XP is MS proprietary software and cannot be "fixed" by thrid party products. For the very paranoid you can also get a free copy of AVAST Virus Protection. http://www.avast.com/en-us/index