Windows 7 Error 0x80072F8F

[Cengbrecht]

If you are trying to activate Windows 7 and have this error (0x80072F8F), make sure you check your date and time settings, making very cautious note to check the year, as in some installs the year becomes vastly different then the server, thus causing a error code to occur.
To fix this problem simply change the date to today's date, and try validating again.

Thanks and have a great day.