Windows Registry is a group of records of all system settings, hardware settings and software settings. The computer's performance can be severely affected by a removed or modified the registry entry. So be careful before selecting the de-registration. If you still want to continue Click on Start and then Run and type regedit and export the key you want to change by following the instructions in the "Backup moving part of the register" above. Now select the key you want to delete. Now, press the Delete key or click the right mouse button and choose Delete. Close the Registry Editor. Follow the instructions and you're done.