Cannot Boot Venue 8 Pro

I upgraded Avast Anti Virus on my Venue 8 and there was a problem so I needed to do a clean uninstall and reinstall. Avast has a clean utility for this purpose. It needs to run in safe mode. When its run it asks if you want to boot to safe mode and I answered yes. Once in safe mode I can't select anything from the clean utility because it appears the touch screen doesn't work in safe mode. If you try to reboot it goes right back to the clean utility.

Any suggestions how I can select the options in the clean utility while in safe mode or an option to get out of this loop.

Any help would be greatly appreciated.

Thanks

Lenny