Help no progrem in the system

I installed Kodi everything was working perfectly. Then I tried to put TITANIUM to see how does it work. I didn’t like it and some how I managed to Kodi to default set-up. I closed Kody and day after I opened Kodi and all the display was different. All the display was different! Big icons, strange menu on the left side with a big system icon on top. When I get to system I don’t have the option of ‘program’ So I can’t go back to default. I tried to remove Kodi and reinstall but with out any luck. Please help
thanks Ilan