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Running antivirus on out of support operating systems is not an adequate solution to help protect against threats.This is sort of a general announcement as I have seen this brought up a lot lately.Microsoft Security Essentials falls under the Security Updates category for XP. Which is free and available for all type of operating system. This time you have to rely on third party security tools only. I had seen so many free antivirus still working really fine on XP. You can try a old version if the new one is not working properly.