Hello Udotno,
I am looking into your issue and It seems that I may need some more information to be able to help.
- are you launching UE4 from the launcher by double clicking on Epic Games Launcher and then selecting Launch from the Engine Versions section? or are you double clicking UE4Editor.exe from the install location?
- What version of the engine are you using?
I also am including a link to a web page that has detailed instructions on troubleshooting launcher and installation related issues. If you are able please read through this page and follow all of the instructions listed.
If you are still experiencing the issues after that please attach the verbose logs and I will investigate the problem further. Also if there is any other information that you think might be helpful make sure to include it as well.
Thanks,