YOU MUST DO ALL THIS FROM AN Administrator Account of your windows.
Right click on properties THEN go to compatibility tab then CHANGE SETTINGS FOR ALL USERS (very imp that you do for all users) for the following files
all the above files will be in the installed folder
THEN RUN ACRMP.exe
The logo for multiplayer will come
it will quit and then slip you into Singleplayer mode!!!
DO NOT SET ANY COMPATIBILITY MODE LIKE WIN 98 OR XP ETC FOR ANY OF THE FILES
THIS WORKED ON MY windows 7 64 bit