I just checked mine, you're one up on me, mine shows in Device Manager but doesn't show in Explorer. The difference is I have no use for it, I havn't used it for about 3 years.
I Googled it and found others with the problem, but was unable to find any usefull replies. The main theme is why bother, use usb stick, which is fine untill you need something off one I suppose.
The only thing I can think of if you need files off it is to get a Linux Live cd to boot with and copy the files onto your hard drive. http://www.linux-live.org/
If you need to know how to use it, ask again in a new thread as I know 0 about Linux use.