You can activate Windows 7 without a product key by using the slui.exe command prompt and then entering a series of commands that will change the copy of your operating system to Genuine.

If you have Windows 7 Professional installed on your computer, you don’t need to do anything to activate it – it’s activated automatically. If you don’t have a product key, or if your copy of Windows is not genuine, it’s still possible to activate it with Microsoft’s automated phone system but requires an internet connection and a telephone number.

To be able to use this method, you’ll need your original media at hand and need to insert the installation DVD into the drive so that it boots from there. You’ll also need access to an active phone line, so if you get one of those annoying