EB can't recognize Alexander disk?

[roman dude]

Okay, I want to play EB on alex, so I downloaded and installed EB 1.1 and 1.2 and the alex mini mod pack, but every time I try to start EB, the alex icon comes up and then an error message pops up saying that i need to insert the correct CD, although I have the alex disk in the drive. Anyone know what is going on here? I put the normal RTW disk in and EB ran just fine and alex runs just fine when I play the expansion, so I know the disk works.

EDIT: Okay, I'm getting very frustrated because I just uninstalled and reinstalled everything, and yet the same error keeps coming up. I know the alex CD works because I can play the expansion just fine, but for some reason EB will not run off of it even though it will run off of the RTW disk. I followed the instructions in Lz3's mini mod pack thread for the alex install, but it still won't work. When I try to run EB on alex off of the "Play Single Player" icon, it says it can't find the disk, and when I try the "Run Europa Barbarorum" icon, it says it can't find the mss32.dll file. Thanks!

Update: After yet another complete re-installation going exactly to the instructions in the mini-mod thread (and also a registry cleanout to make sure that wasn't the issue), the 'insert correct CD' message is still popping up when I try to play. I checked to see if the vanilla alex expansion is working and it is. This is so frustrating as I bought alex just to play EB on it, I would very much appreciate any help!