Mass Effect 2: Old save files not found, DLC appears to be missing

keep a copy of you save files including the profile folder as you can see there is a serial number to it in the folder name so I think it is a very important to identify the save from your folder and if you are having, save loading problem all you have to do is start a new like start a new game and finish creating your new profile and keep a copy of that and in another folder and copy-paste one of your  old save to the new profile in it you can continue you previous save