Problem:" you may be victim

Hello,
If it is the problem with Microsoft Genuine Validation and you are using A Pirated Copy Of Windows XP (XP Pro, Media Center 2005, Tablet PC, Home or other), Then just find the WGA.exe file in C:\Windows\System32 (It is with a serrated star like icon), And delete it after killing the application using task manager. And you are back in track, no need to buy and reload.
Turn off automatic update, rather use "Notify me but don't automatically download or install them."
Prevent downloading "Microsoft Genuine Validation Diagnostic Tool"
To get WGA crack visit www.piratebay.org, type and hit. Always free.
I will recomend to use Microsoft Genuine XP.

Thank for use FIXYA.
Hope this helps.
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Maybe you are not using a genuine Windows operating system. you have turned on the automatic update from your PC, and microsoft detected that you are not using a licensed one. I suggest, do a reformat and reinstall a genuine Windows, or if you are planning to use the unlicensed one, turn off the automatic updates.