NEXT LEVEL USB cannot be used as a USB?

[Suteisi]

I've had the USB for a little while, but today when I put it in my computer and tried to transfer a file on it (I want to put a document on the USB to then transfer it on another computer later) it didn't work.

It gave me this message:

http://i42.tinypic.com/105pit0.jpg

(Direct link, because the image is big.)

Has anyone experienced this?

I tried to look in the properties if I could change it, but I couldn't find anything.

Thanks in advance!