Sorry for not reply earlier, I’ve had so much on in last couple of weeks and not just window cleaning.
As advised I did a data restore from a back up I had on a usb stick. Unfortunately the last back up that was usable was over a month ago so I had to manually imput quite a lot of data again.
Luckily i could still access that data from the corrupted back up.
Everything is back to normal and working fine now. Also a lesson has been learned - I make sure I back up every day now and on to 2 usbs incase anything hapoens to one of them.
Totally appreciate all the advice given on here,
Big thanks to all who replied