Oh great, well that's just nice...

"Microsoft Denies Windows 7 Has NSA Backdoor"

Oh great...

"Earlier this week Tom's Hardware US learned that the National Security Agency (NSA) has been working with Microsoft to improve the security measures of Windows 7.

This cooperation by the two bodies led some to theorize that the NSA and Microsoft may have somehow built a backdoor into Windows 7."

Of course, there's denials...

"The key point is that the NSA is not the right agency to promote computer security in the private sector," Rotenberg argued. "The risks to end users are real -- the original NSA key escrow proposal, 'Clipper,' was a terrible idea -- and there is too little transparency about these arrangements."

Links:-
Microsoft Denies Windows 7 Has NSA Backdoor

NSA Helping with Windows 7 Security