Commonly, Windows does not include the ability to help you remove Razer Cortex, as Cortex will add its service to your system’s Start-up list by default.

Furthermore, Cortex is a .NET 4.5 based application, you too need to wipe that potentially unused component so you can entirely delete Razer Cortex from your machine. And, improper changes made to filesystem and/or Registry Editor could be putting your PC at the risk of being messed up.

How do I manually uninstall Razer Cortex for my own Windows 7?

1.  Save or export all your personal info, including your gaming profile, then exit your Razer and/or associated account and then, quit the client from taskbar.
2. 
3. Make yourself the Admin user.
4. Go to Control Panel if you’ve saved it on your desktop, too.
5. Enter Uninstall a program list, as usual.
6. Locate your unwanted Razer Cortex in the programs list, launch Uninstall or similar options in the list.
7. 
8. In order to “automatically” uninstall Razer Cortex, you hit the Yes button on the following “Uninstall” dialog window.
9. 
10. Wait while your OS helps you get rid of Razer Cortex. And then, exit the abovementioned “Unisntall” wizard.
11. 
12. Save your current work, have your PC restarted normally. Disable or delete (recommended) the mentioned Cortex service from start-up, and then remove the said .NET 4.5, clean related traces so you can wholly uninstall Razer Cortex.
13.