Reassigning drive letters

I have a Dell XPS 300 running Win 98 1st edition. The HD is partitioned into C, D & E with a Zip drive on F and CD-ROM on G. I recently tried to install a second HD for more storage space. Everything went fine until I realized that Win 98 had assigned the second HD as D and reassigned the additional partitions of the first HD to E and F. Naturally, nothing on these partitions is now registered correctly.

Drive letter assignment is greyed out in the Device Manager. Is there anything else I can do to correct this short of reinstalling all that software?

Thanks,
Keith