XPS 18 Touch Screen Not Working After Windows 10 Upgrade

I just recently updated to WIndows 10, and after doing so the touch screen functionality of my XPS 18 all-in-one has stopped working completely. Minutes prior to the update the computer and all of its functions worked perfectly. I've searched through the forums and discussions and only can find info on a similar problem with the 8.1 update. None of the fixes for that situation seem to work here. In Device Manager, there is no HID Touch Screen driver to update, enable, or otherwise. It appears to be completely missing, and the computer seems to be recognizing the display as a generic PnP monitor. I was hoping this was a Windows 10 issue, so I reverted back to 8.1 hoping to restore touch screen funtionality. This did NOT work either. Currently I'm back to Windows 10, still with no touch screen. Also, the computer seems to be responding strangely to the power stand. When I dock the XPS 18 on the power stand the computer makes the "USB device disconnected" sound, and when I take it off of the stand it make the "USB device connected" sound. Not sure if this is related to what's happening with the touchscreen, but it started happening at the same time. Any help with this problem would be much appreciated.