AntivirusXP (Antivirus XP Pro, AntivirusXPPro) is a rogue anti-spyware program that uses false spyware results to urge a computer user to download Antivirus XP's full commercial version. Antivirus XP is a clone of Antivirus 2008. AntivirusXP is the perfect example of renegade optimization software that has been designed to display false and exaggerated results, as a means to coerce a user into purchasing the full version software. This particular malware, AntivirusXP is installed under deceptive pretences, infiltrating the user’s PC without their approval or knowledge. AntivirusXP is advertised through the use of advertisements that pretend to be online scanners. AntivirusXP then prompts the user to download and install AntivirusXP, so as to attempt to create a solution and fix the user’s computer. These scanners, though, are also scams and have no way of knowing what is running on your computer and thus can be ignored. Should a user actually download and install AntivirusXP, then the program will start every time your computer is rebooted. Once started, it will scan your computer and state that your computer can run more efficiently if you purchase AntivirusXP and let it optimize your computer. In fact, it has been shown that by just having AntivirusXP running on your computer can make your computer slower and run less efficiently. AntivirusXP is particularly damaging to a computer system, once it has fully embedded itself within the PC’s system, therefore it is given a high priority security risk status by many computer analysts.