1) Start Command Prompt: Click the Start Menu Button Orb (On Lower left), In the Start Search Box, key in:
And RIGHT CLICK IT, and Run as Administrator.
You can also Manually open CMD, by going to: START> ALL PROGRAMS> ACCESSORIES> Command Prompt
And Run as Admin
2) Key in the following CAREFULLY:
slmgr.vbs -ipk 3YFJ7-3486F-7488V-3VDMF-2PJMW
This key is a deactivated key from Microsoft, and does NOT work for activating
3) wait a few seconds to a minute to deactivate Windows 7.
4) Once you see a pop up related to deactivation, check and see if Windows is deactivated. Go to:
Start> Right Click Computer> Click Properties, on the bottom it should tell you a time Limit
Note : please make SURE you are running an Administrative Account!