Partition/data recovery help needed - inaccessible after saving DeployCenter/DriveImage image files to drive

I have an 80GB Maxtor drive with 3 partitions:

- C: 20GB primary FAT partition running Win98
- D: 20GB extended FAT partition (not bootable, used only for file
storage)
- G: 35GB primary NTFS partition running W2K

I installed PowerQuest DeployCenter V5.01 to the W2K drive (G,
created a backup image of (G and stored the image files to the (D
drive. All went OK until I tried to access the (D drive from
Windows Explorer in either Win98 or Win2K (still visible in the
navigation), but get a "D:\ is not accessible. The parameter is
incorrect" error and a check in Computer Management says this drive
has 100% free space.

So ... looking for recommendations on how to restore my hard drive,
regain access to my D: partition & files and wondering how saving the
image files to this directory would have been able to cause this
problem.

Any help would be greatly appreciated!!!
Emily