Hi - thanks for taking the time to offer your advice to me.
Please forgive me if I come across as a real novice, but I'm not 100% clear on what you are suggesting and thought it best to check before making a cock-up.
I have made a backup of XP11 through steam and looking at the folder it has broken it down into 88 separate folders within the backup directory, each labelled Disc_1, Disc_2 etc.
I have then restored the game from the backup through steam, however there was no change in what I experience on trying to load the game.
I just wanted to check if I you think I should again totally uninstall and then reinstall the game, create a backup but then it the bit i'm confused - do you think I should try copying (through windows explorer) the backup files from their directory into the original game's directory, replacing the original files? If so, how do I overcome the 88 disc folders?
Sorry for what must come across as incredibly basic computer knowledge, but any advice would be really appreciated.