Problems connecting to PC

I've tried to connect my psp to pc, but am having troubles.

Everything seems to install fine. A new removable drive pops up, but when I open it it's empty. I can't copy anything into it, can't create a new folder, nothing.

I've had my psp since launch day, firmware 1.5. The cord seems fine because my MP3 player connects to the PC fine with it.

And I'm pretty sure I formatted my mem card when I first got it. It's loaded with save games and has worked fine for me. I just want to try and get some photos/mp3s on it.