"ms dos" compatability mode

I HAVE 2 HARD DRIVES AND THEY HAVE A CONFLICT WITH THE IRQS.  I PREVIOUSLY ASKED A QUESTION ABOUT THIS PROBLEM AND THE SOLUTIONS I GOT DID NOT SEEM TO WORK. (PER THE PREVIOUS RESPONSE TO MY PROBLEM) I CHECKED THE REGISTRY AND THERE WAS NO "NOIDE" STATEMENT.  I HAVE DISCONNECTED THE DRIVE OTHER THAN THE MAIN DRIVE AND THE CD ROM BUT WHEN I REBOOT IT STILLS SAYS "RUNNING IN MS-DOS COMPATABILITY MODE".  THE DRIVES WORK BUT NOT AT "OPTIMAL SPEED".  I HAVE A PENTIUM 200 W/ MMX, 48MEG OF RAM, 1 520K DRIVE, 1 3.2G DRIVE (3 PART), 16-BIT SOUNDCARD, 4X CD-ROM, A 3.5 FLOPPY, AND A 5.5 FLOPPY.  ALSO, THE MAIN "C" DRIVE IS SET AS THE MASTER DRIVE.  I REALLY WOULD LIKE TO FIX THIS PROBLEM FOR GOOD SO IF ANYONE HAS ANY OTHER IDEAS...I WOULD BE GRATEFUL!!!TB