OK,First what type of HD controller do you have? If is SCSI here's what to do:
1. Make sure the SCSI card will work with win 95 and you have the driver downloaded for the jazz and zip drives.
2. Check the settings on the HD and check to see what SCSI device number its assigned. If available, change the HD SCSI device to 2.
3. Assign the jazz drive to SCSI device 0 and make sure that the drive is not terminated, then assign the zip drive to device 1 again make sure the zip drive is notterminated.
4. If either the jazz or the zip drive must be terminated then you will need to unterminate the HD. Now on to the harder one..
If your HD controller is IDE, you will need to check and make sure that you don't have an irq conflict with the SCSI card. Check IRQ settings on both controllers and change on of them to another IRQ. Then proceed as above EXCEPT either the jazz or the zip drives will have to be terminated and the SCSI device will have to change to 0 and 1 (device 1 should be terminated).