For anyone else who encounters this problem and has a legitimate license that should not be expiring, there is a simpler and better solution.
1. Find and write down your windows product key.
2. Click Start >>> Control Panel >>> System
3. Click the “Change Product Key” link at the bottom of the form.
4. At the dialog that is displayed re-enter your windows product key, then click OK/Activate.
Rather than trying to use the Key server, the normal activation process will be followed, and your license will be activated as expected. Also, I’m not completely sure, but I believe the same work around can be applied to volume Vista licenses that hit this issue as well.
Cheers.
-jfc