MS-DOS mode compatability running on both drives

I have also this PB 486-DX-2 w/80 pentium[using WIN95] OS that is running in ms-dos mode on both C & D drives. Everything I've read, techs spoken with, money spent trying to get corrected, DOESN'T WORK. Without wiping hard-drives, how can this be corrected??? In plain language please somebody...
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Try typing at the command prompt
C:>fdisk /mbr
and then reboot...

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