To remove activate windows watermark, the proper way is to activate your Windows copy using a legitimate digital license or product key. To do this, go to the Windows Activation option and see if the software is activated. When the computer has recently undergone a change in its hardware components, then the Activation Troubleshooter will be able to help you link the software license once again. In case you do not have a legitimate license yet, you have to acquire one first for you to be able to remove the watermark legally.