Clean Utility Stuck

I have Avast Free installed on my Dell Venue 8 Pro Win 8.1. After I tried to upgrade I had some problems so I wanted to do a clean uninstall and reinstall. When I ran the clean utility it reboots the tablet to safe mode but once the utility loads I can’t select anything as it appears the touch screen isn’t working. When I reboot it just loops back to the clean utility where I can’t select anything.

Any suggestions how to get out of this mess?

Thanks…
Len

Use a usb keyboard, not a touchscreen.

Mini usb port. Would need some kind of converter which I don’t have.