Its nothing to do with the CMOS battery.
If it is anything to do with the CMOS settings, then all you will have to do wil be to take the battery out for 2.5 seconds and then put it back in. This will wipe the cmos settings and return the BIOS to their default state.
It does sound like you will need to check the jumpers on your mainboard as it may just be an address bus problem.
Refer to the mainboard help book for the correct jumper settings.