I have bought original Medieval 2 total war gold edition CD-s and i want to play it multyplayer i have account when i put everything and click enter its shows Logon failed-invalid CD-key, i watch some instructions to go to regedit and find sega bla bla bla.... but i recentrly try to install Stainless steel patch and i don't succed so i delete it, in regedit i manage to find SEGA but its not saying Medieval but Stainless steel and don't have option to change CD-key what should i do...if is any help my medieval is in D: Drive