Windows 7 OEM versions
According to Microsoft, roughly 90% of all copies of Windows are purchased with new PCs, preinstalled by Original Equipment Manufacturers that build the PC and sell Windows as part of the package. That will certainly be true with Windows 7.

INSTALLATION:

1)Download All Links & Extract The Rar File
2)Burn The ISO To A Fresh Dvd
3)Install Windows 7 Ultimate HP OEM
4)After Installation,windows already activated.
5)For other system( with out HP machine), just run this activator:
--> No need for Serial or Activation