How do I get my memory stick to communicate with my computer?

I have a 4G memory stick that use to communicate with my computer, but now won’t. The computer obviously detects it because it gives the option to safely remove it. The problem is, it obviously works, but I can’t access it. It doesn’t show it in “My Computer” and doesn’t come up with automatic options when a memory device is connected. Is there an advanced option I can use to forcefully access the memory stick? I’ll take anything that will work.
I tried it on another computer long ago, and it worked. See the Entire Story