I got a reply back from HP...

Dear George:

Thank you for contacting Hewlett-Packard.

I am sorry for any inconvenience. Due to licensing issues with
Microsoft, HP does not ship OEM versions of the operating system with
our computers. You can order recovery CDs to be shipped with you PC or
you can choose to create them during your initial setup of your PC.

HP Pavilion Media Center m7760n (RK570AA)
- 2.13GHz Intel Core 2 Duo E6400 processor
- Microsoft Windows Vista Home Premium
- NVIDIA GeForce 7500 LE graphics controller
- 500GB 7200 RPM hard drive
- 2GB of 533MHz DDR2 PC2 4200 SDRAM

For further information on the HP Pavilion Media Center m7760n, please
visit the following web site:



HP Pavilion Media Center m7760n Desktop PC - Product Specifications
s&dlc=en&product=3339302&lang=en