preparing automatic repair XPS 8930

Hello
My xps 8930 i7 (new) is stuck on "preparing automatic repair" and stays there even after several reboots and several goes via the recover os assist option. We turned the desktop on today and this problem occurred, it was working ok yesterday. The only thing that was different was I added some firewall rules to the sky router which I have since removed and the same problem persists. I have also tried going to windows recovery from os assist and that hangs with "Please wait".
I have already run Running the ePSA diagnostics - no issues and I have already run recoveryassist OS - this found and fixed a problem with the partition, but the same issue occurs
I did not receive a windows install CD with this. Is my only option to reset to factory settings ? I hope not.
Thanks for any help. I have googled everything I could find ...

 

Download windows 10 on a USB stick, run the USB stick, revert back to a couple of days back.

 

thanks, I'll try that this evening

 

I tried. I tried ALL of the options and none of them worked. I haven't had the pc long enough to do backups etc. I've only had it a couple of weeks and it's gawn tit-uth up-uth already ..
I guess my only other option is a factory reset via the F12 recovery assist . That probably won't work either ..

The only thing that worked was the Dell supportassist OS recovery (F12) - factory reset option under restore.
I tried all of the windows repair software options and none of them worked.

.. 6 months later, the exact same thing happens again. The only way to fix it was a factory reset. Is there anyway of protecting my pc against this sort of thing does anyone know ? This time my daughter switched the pc off at the plug while it was still on, resulting in an endless automatic loop repair. I have educated the kids about switching the pc off at the wall, but the same thing could happen in a power outtage.