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did you buy fake hardware
you might be surprised
edit:
wxp sp3
"Microsoft clarified that there will not be any integrated SP3 release for Windows XP Media Center Edition or Windows XP Tablet Edition.
That means you wont be able to buy or obtain a complete Windows XP Media Center Edition / Tablet Edition SP3 CD. In addition, users of Windows XP Media Center Edition or Windows XP Tablet Edition will only be able to update to Service Pack 3 through Windows Update."
ref
confirmed rtm date english 21 April 2008. (Release To Manufacturing)
manual update/download center 29 April.
Automatic update 10 June 2008.
Comments
Luckily my DFI Lanparty UT NF4 Expert isnt on that list :P