USB Autoplay settings

Hey! I have a USB I've worked with for over an year and it works fine
usually. Every time I plug in, it gives me an option as to which way I would
like it to open and that's fine by me. I just cancel it or select folder.
My problem came up a few days back. If say I click cancel when it asked what
I want to do with the USB then I go to "My Computer" and press "flashdisk
(F" It tells me which ways it should open the USB. And that's still oaky.
The problem is that all the option is for a file not a folder. (There is no
folder option only things like microsoft word, photoshop, windows media
player and etc). And it annoys me because now everytime I want to open my
USB, i have RIGHT click on my mouse and select "open" instead of "auto play"
so I can see my file. It's like it's reading it as a CD or something.
Does anyone know how I can change it back? Thank you!
-Lily