Do you have a legal OEM version of Windows?
Some OEM manufacturers (Dell, Compaq, HP, etc etc) do not supply a CD, or supply their own system recovery/restore CD's, but you should still get a COA (Certificate of Authenticity). Click here for more info
XP Home OEM
XP Media Center (Only available as OEM)
|XP Professional OEM||XP Professional X64 OEM (Only available as OEM)|
|Vista OEM (Colour may vary)|
Vista 64 bit OEM (Colour may vary)