Userdata should be saved in Burnin' Rubber 5 HD\BurninRubber5HD_Data\UserData\ Can you check if the files are still there? There should be 2 Profile.sav & Settings.dat
Did you check the UserData folder as well? Was that folder there at all? The game won't remove that folder - it will only create it if it is not there . Was this a clean install?