Ravy

So bear with me folks....I'm quite a newbie when it comes to electronic thingies...see? anyways...I plug my Craig Adroid Tablet CMP738b into my pc via the usb cable and it shows up as driver H and I (I have CDEF drives already...G? ) anyhoo...and when I click on the icon to open them up so I can move pictures, etc. onto it ..it says insert software disc...or something like that. It does not open up like a regular drive that I can click on and enter things into or vice versa. What am I doing wrong? I really need help with this. ...thanks. I have Windows XP on my PC.