It wasn’t probably shut down, just hibernated. check your Windows settings,
you probably just damaged the MBR, the data on HDD is probably still intact.
quick way is to just boot a live CD with ubuntu, it should mount it and see all the files.
to repair the MBR, just use minitool 9.1 free And partition recovery, then run quick skan, then find the deleted partitions, and write them to the HDD.
there are at least 2 other programu that have the same UI and ability, I just use minitool.
Well i won’t take any responsibility for that ofcourse, it’s on your risk.