I googled your problem and found this, baring in mind this was for fm2010 so i'm not sure if it would work so i apologise in advance if it doesn't.
''Yep, if it's an xml parsing error do this:
If you have a shortcut on your desktop you can do the following:
1. Right-click on the FM shortcut.
3. In the "Target" field, add the --reset_preferences command line option after "fm.exe", so it should look like this:
"C:\Program Files\Sports Interactive\Football Manager 2010\fm.exe" --reset_preferences
After the game is working remove the extra command from the shortcut.
If you don't have a shortcut to the game create one. ''
I also have the same problem when i open my fm it comes up with that message but has stopped now once i deleted the fm 12 file on app data, i then ran it again and a new file was created. I also dleted the just the settings folder and restarted my laptop and ran it again and that didnt work either. However my fm opens fine and loads my other saved game but when i try to load my other one (the one i have been playing) it goes to load like a quick flash then comes up with the little box saying the saved game could not be loaded. I last saved it today and havent had any previous problems with it. Can anyone tell me what i need to do so i can access it again? any help would be great? How can i get someone to see if they can decorrupt my file?
I had this happened. Since it said it had to do with microsoft I basically ran win7 from the cd. Asked to install win7 again, but said my system was more up-to-date. After that run everything was fine for me. I don't know if that will help for you. Also I did install CCcleaner and basically made sure everything was basically deleted from my computer when I ran it. Now it runs like a charm.