Microsoft allows anyone to install and use any version of Windows 7 for 30 days without having to enter an activation key. But you can officially extend this trial for 120 days or 4 months by using a utility that is supplied by Microsoft only. This utility is called the Software License Manager (slmgr) and it gets installed with default Windows 7 installation.
To see how many days are left for your trial version of Windows 7, click Start, right-click Computer, and choose Properties. At the bottom of the screen under Windows Activation, you’ll see the number of days left in your trial period. [Read more...]