Cannot uninstall Epic Games Launcher

I installed Epic game Launcher and played Unreal Tournament on 17/10/2015.
I’m trying to install the new one but i can’t, same when i uninstall. It says " The account specified doesn’t exist "
Here is a screenshot :

Hi Daamshadow,

I’m sorry that you are having an issue with the Epic Games Launcher. In order for us to offer the best support, we have recently modified the process for how Epic Games can help troubleshoot your Launcher issue. Please visit for technical support, here you can find information and solutions for common issues, as well as a contact form if you still need additional assistance. Thanks!

Okay, thanks.

hello how do I uninstall UE4 from my system getting theres no uninstall file