if your windows xp is not original, sometimes you forgot to turn off the automatic updates. if its happen your win XP will be error coz the microsoft site is change your windows registry file, your desktop can not be changed it’s only a black wallpaper with a note: “you may be a victim of …..” and some facility of win xp has disabled… you may need to re install your winXP : ( , but now you don’t need to do it anymore. coz with this apps you can change back your win Xp to be normally again. just click on the “WgaTray.exe” and restart your computer and…. you’re DONE! : ) .
i hope this is usefull too…. : )