finds removable storage as network drive

I am using an image of Win XP to load mulitple systems. Some of them discover the CD-RW drive or USB flash memory and lists it under network drives. It’s the same network drive which may have been mapped before on the original image. When I look in disk management I can see the device correctly and the drive letter. On one I was able to delete it and rediscover it correctly but I’m having trouble with the rest. I can’t disconnect the “network drive” or delete it and when I remove the device it comes back the same way. These are on desktops and notebooks from diffent manufacturers. Why does it do this? How can I avoid it? And how can I fix it when it happens? Please help.