No PVR add-on enabled

If anyone can help me with this, I would be most grateful.

I am getting, what seems to be a familiar error message when I load Kodi “No PVR add-on enabled – The PVR Manager has been enabled without any enabled PVT add-on” The difference is that in my case this message is on the screen but the GUI has then be totally deactivated, and so the mouse and keyboard don’t allow me to get the settings to implement the usual fixes.

Any wizard out there know how I can get round this?

Thanks a lot.