After installing Windows Vista or Windows 7, you have a 30 day grace period before activation is required. We've recently been having problems accessing our internal use license keys under our Microsoft Partner/Action Pack subscription, and Microsoft has been slow to resolve the underlying technical issue. Unfortunately, a coworker installed Windows 7 about a month ago, expecting the issue with license keys to be resolved within 30 days.
If you need to renew the 30 day grace period, it is possible to extend it twice – providing up to a total of 90 days to obtain a license key. To extend the activation time for Windows Vista or Windows 7, launch a command prompt with Administrator privileges and type: slmgr -rearm