USB Drive not accepted

Okay here is the situation. The computer I have at work is an Optilex GX270 it has four drives (CD-RW, DV-ROM, floppy, zip). It also has some network drives that are using some letter drives. Of course my hard rive. I try to use my USB drive and it didn't work. It is a 256MB Lexar with no security software what so ever. Windows says it finds it, but it doesn't show it under my computer. I went to check in the computer management tools and I found it but when I went to explore it show me one of the network drives. I believe that the problem is that my computer names the USB drive the same as my jump drive or maybe I'm wrong can nay one give some help on that.

Thank You

Carlos