Well!, assuming you still have the problem, next questions...,
- how long have you had the HP and did it come with Windows 7 already installed?
- Did it come with a Windows CD / DVD ?
- Is there a 25 Alpha/Numeric Windows Product Key printed on a Microsoft 'Proof of Purchase' Label sticker anywhere on the system unit, usually located at the rear / underside?
You could try downloading and running this Microsoft diagnostic tool which will produce a comprehensive report about you system status including license info:
http://go.microsoft.com/fwlink/?linkid=52012
The diagnostic report may be useful if you later contact Microsoft for clarification.