This update has really nothing to do with XP an an operating system. The Windows Malicious Software Tool is a separate component that is included in all Windows operating systems. A user would see the same update for Windows 7 or Windows 8. Might be a good idea to install it if you are still using Windows XP to access the internet.
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Mark & Linnae
Birmingham, The U.P., Saginaw, Bay City, Toledo, Columbus, Dayton
& The Village of Chatham 
"I wish I didn't know now, what I didn't know then"
-Bob Seger-
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