OK, as I said originally, we are now at the point of wipe and reimage since the "easier" attempts failed to correct the issue. You will need to back up and files and data stored locally and be prepared to reinstall apps and programs. This isn't a quick process, but once complete, you should be fine.
Go to https://support.microsoft.com/en-us/surfacereco... (with a different Windows computer if yours is not working properly) and download a recovery image for your Surface. You will need a 16GB USB stick formatted FAT32. Unzip/extract the recovery zip to the formatted USB stick and then-
To reset your Surface from a USB recovery drive:
Step 1: Make sure your Surface is turned off and plugged in (hold down the power button for 30 seconds).
Step 2: Insert the USB recovery drive into the USB port on your Surface.
Step 3: Press and hold the volume-down button while you press and release the power button on your Surface.
Step 4: When the Surface logo appears, release the volume button.
Step 5: When prompted, select the language and keyboard layout you want.
Step 6: Select Troubleshoot > Reset your PC.
If prompted for a recovery key, select Skip this drive at the bottom of the screen.
Step 7: Select the target operating system you wish to reset. This refers to the current operating system installed on your Surface.
Step 8: Select Yes, repartition the drives, and on the next page, select Next.
Step 9: Choose Just remove my files.
Step 10: Select Reset.
Surface restarts and the Surface logo displays while the reset process continues (this can take a while).
After you complete the above, run winver to find out which build of Windows you have. If it is NOT 16299, go to https://www.microsoft.com/en-us/software-downlo... and select Update Now. Then we will continue normally from there.
Sorry about the pain and frustration. But the above will get things back to a good configuration.