you can either do as emptyeighty suggests and upgrade the game to version 1.1..i think its a 15meg patch so if you got a slow connection will take ages to download or you can go the patches section of this site and download the version 1.0 patch and install it in the game folder.
you need winace to unzip the patch....go to
WWW.WINACE.COM and download the latest version of winace program.
then download the patch for the game.
once you downloaded the patch winace should recognise the patch, click on patch and then the mohaa.exe ...then once winace is open click extract then my computer then local C: drive then program files then EA GAMES folder...then click unzip or extract patch....should give you the option to overwrite the existing file to which you say yes.
close winace then start up MOHAA .....the game should now load.....for extra realism try the 23kb blood patch but extract it into the folder called MAIN in the EA GAMES folder.
see how ya go .
cheers.
sorry if this isnt brilliantly clear, im not gr8 at explaining how to do stuff.