How do I fix my proscan tablet the system ui has stopped

if your have faced this issue while using your computer. Then you need to follow these steps to fix UI Failed to Load on windows

https://www.mygeekshelp.com/avast-ui-failed-to-load-after-windows-10-update

Try this hard reset. You will lose all data. the device will be like it was new. Its your only option. Factory Reset on Proscan PLT7223G or Tablet Vol Rocker

What happens when you hit the internal reset button?

Have you tried the reset with the paper clip in the reset hole yet.?

I think the reset hole is on the back. Press gently into the hole with a paper clip.

You will lose all data however and it will go back to factory default settings.

This is a common problem with Proscan tablets. Make sure you charge the battery fully before starting.

Try resetting the system

Go into settings.

Apps. Select Google.
Clear cache.
If that doesn't work select uninstall updates. You will be questioned if you want to reinstall factory version. Select yes.
If that doesn't work back up and reset tablet.

I am not familiar with your brand of tablet, but my Proscan 10" one has a reset button on the back. If you can find it listed in the owners manual or somewhere on the tablet, I would try that next.

UI means "user interface." It likely means "GUI"--"graphical user interface"--pretty pictures on a screen upon which one points and clicks. Thus, you can't use the touchscreen. Try a "soft" reset. If that's ineffective, try a hard reset--often called something like "Restore Factory Settings." If you find the manual, physically--or online via a mfr. site PDF, follow it's procedure for those. Otherwise, try pressing the power on button for 20 seconds or so--see if the screen then offers hard reset. Press "Yes" or otherwise assent.