Extend Windows 7 Activation

I am testing Windows 7 Pro on my laptop and wanted to decide if I can get by with that instead of Ultimate.  Well, my time is running out and I need a couple day to backup everything before I change it.  So…  I need to “rearm” the activation system.

Go to the start menu, and in search box type “cmd” and hit CTL-SHIFT-ENTER to open the command prompt with elevated rights.  Type this:

   1: slmgr -rearm


You’ll get a popup telling you it was successful and you need to restart a few seconds later.