Phantom Drive

I installed a Western Digital 8.4 G hard drive in a three year old system and intalled Windows 98 SE after I got it formated. I used the Ezi-Bios software provided by Western Digital to make one big partition on the drive. I also have a second smaller hard drive, a CD rom and an Orb 2.1 G removeable drive. When I go to Windows Explorer it shows a phantom drive E:. How can I get rid of it. Sometimes I can not access the CD rom or the Orb drive because Windows Explorer can’t find them, otherwise they are drives F: and G:.