I just downloaded a Defrag tool and am in the middle of using it and all I can say is WOW! 10,608 files were fragmented so it's taken over an hour and a half to defrag them, but hopefully the computer should run better now, even if EADM doesn't work lol.
EDIT: yeeeeeesssssssss!!!!! *runs in circles around house* it's all fixed! I completely uninstalled everything to do with EA, did a disk cleanup and defrag, then installed sims 3, then world adventures, then clicked on the updates part of the launcher and downloaded eadm from there and it works perfectly.
