If you are playing the version sold on Steam (which was recently updated to remove GFWL and replace it with Steamworks), old GFWL save files will not work . You must specifically look for a save file labeled for the "Steam" or "No GFWL" version.
On Windows 10 and 11, DiRT 2 saves data in two distinct locations. You must back up and replace both folders for the save to work correctly: PCGamingWikihttps://www.pcgamingwiki.com Colin Mcrae Dirt 2 Save Game 100 Pc
Your driver profile is at the highest rank, with all liveries and horn sounds available. All Upgrades: If you are playing the version sold on