To use Windows 7 you must have to activate it within 30 days of installation, otherwise it will goes to reduced mode and after that it will stops working. However, here is a trick to use Windows 7 for a year without activation.
Probably, you might have heard about a tweak that increases the 30 days time limit to 120 days (4 months). To do so, follow as described below.
- Click on Start Menu - All Programs - Accessories and then right clicks on Command Prompt and select Run as Administrator.
- Now type-in the following command: slmgr –rearm and hit enter. You’ll be prompted to restart the PC. Upon restart you can use Windows 7 for 120 days without activation.
- Click Start - Run - type regedit to open the registry editor. In the registry editor Navigate to: HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / Windows / NTCurrentVersion/ SoftwareProtectionPlatform.
- Now, look for the SkipRearm in the right hand pane and change its D value to 1 and close the registry editor. (See screenshot below)