Windows 7

If you got your hands on a copy of Windows 7 (pre-beta or beta) you should have also received a Windows 7 product key with it to test the new operating system extensively. If you did install it without entering the product key you might have noticed by now that the operating system can only be tested for a period of 30 days before it requires registration.

There is however one simply command that can extend the trial period by another 30 days in case you need the extra time to find the key or to evaluate the Windows 7 operating system. To use it you need to load the command prompt in Windows 7 as an administrator and enter the following command:

sysprep /generalize

You can alternatively try the following two commands which should do the same:

slmgr.vbs –rearm
rundll32 slc.dll,SLReArmWindows

Reboot Windows 7 so that the changes can take effect. If everything worked out you should be able to test the Windows 7 operating system for another 30 days.