When you run Dosbox does a second window open up in addition to the main Dosbox window? Have you tried to disable digital,adlib,etc sound in Dosbox first, your setup may have problems playing multiple digital streams at once.

Yes, 2 windows open...on the first, here's what I get :

CONFIG:Loading settings from config file dosbox.conf
DOSBOX:Unknown machine type auto
Partial reserve: 1=3 2=10 3=6 4=4 5=3 6=0 7=0 8=0 9=6
Key 0, depth 1, factor 488
Key 0, depth 2, factor 1021
Key 0, depth 3, factor 4498
Key 0, depth 4, factor 82020
Key 16, depth 1, factor 417
Key 16, depth 2, factor 732
Key 16, depth 3, factor 2214
Key 16, depth 4, factor 18145
Key 32, depth 1, factor 357
Key 32, depth 2, factor 524
Key 32, depth 3, factor 1090
Key 32, depth 4, factor 4014
Key 48, depth 1, factor 305
Key 48, depth 2, factor 376
Key 48, depth 3, factor 536
Key 48, depth 4, factor 888
Key 64, depth 1, factor 261
Key 64, depth 2, factor 269
Key 64, depth 3, factor 264
Key 64, depth 4, factor 196
Key 80, depth 1, factor 223
Key 80, depth 2, factor 193
Key 80, depth 3, factor 130
Key 80, depth 4, factor 43
Key 96, depth 1, factor 191
Key 96, depth 2, factor 138
Key 96, depth 3, factor 64
Key 96, depth 4, factor 9
Key 112, depth 1, factor 163
Key 112, depth 2, factor 99
Key 112, depth 3, factor 31
Key 112, depth 4, factor 2
MIDI:Opened device:mt32

And then there's the second window that opens with the "dos prompt". Can you see anything there ?

How do I disable the adlib and other stuff like you said ?

The stuff in the second window is all correct (it is the debugging messages for the MT-32 emulator itself). When a game uses the MT-32 more messages should appear.

To disable the other stuff like adlib you need to toggle the appropriate setting in the dosbox.conf file (I don't know where this file is stored in the Windows version). Switching off the other stuff is a bit of a long shot but I don't know what else it could be.