Here Is How To make you non-Genuine Copy Of Windows XP a Genuine One(Like If You bought It From Microsoft itself).This mostly used to get those updates that we cant live without them!

1.Open Your Registry Editor (Start > Run > "Regedit")

2.Find:

"HKEY_LOCAL_MACHINESOFTWAREMICROSOFTWindows NTCurrentVersionWPAEventsOOBETimer"

Double Click on it and change it (Doesn't matter how.delete some add some delete everything.just change it!)

then close regedit

3. Now go to  ( Start > Run > "%systemroot%system32oobemsoobe.exe /a" )

4.4) the activation screen will come up, click on register over telephone, then click on CHANGE PRODUCT KEY, enter in this key: JG28K-H9Q7X-BH6W4-3PDCQ-6XBFJ

5.Have fun with your Genuine Windows XP.