Preparing automatic repair loop

HELP!!!! a couple of days ago while going through my Toshiba laptop that my 17 year old has been for the most part been the only one using a popup said that windows installed new updates and needed to restart so I restarted it. Well needless to say that once it restarted I got the message "Scanning and repairing drive C:' then another black screen says "Preparing automatic repair" finally blue screen that staes "windows Defender is offline" and finally runs windows defender quick scan all the way to 100% only to reboot and start the process again. This has been going on for a total of 3 full days!!! I've tried system restore only to find out it can not be completed because of unknown error. Please help there are alot of pictures that my daughter has saved (without backing up) for her high school graduation in a couple of months.