I can’t get cubase elements 10.5 to work properly
It I uninstall everything cubase/ur22mkll will I be able to reinstall or will I have to pay for cubase again. Very frustrating.
No. You don’t have to repurchase. Review this kb article to see what process applies to your situation.
Regards. 
Can someone explain why when I record a track then add a track. It adds (Mixes)what I just recorded onto the new track
How could I reset the cubase elements 10.5,back to factory settings. I don’t know what I’ve done wrong but obviously I did something.
I explained it twice already on your other topic (the one where you state everything is correct…) 
Its nothing to do with Cubase or your computer
Its your sound card settings.
Turn off loopback