My USB was detected but I cannot see it in My Computer

I bought a new USB Kingston flash disk, but the problem is, I cannot get it to work with my laptop. My laptop is running on Vista. It is detected, yes, but I cannot have it to appear in my disk drives in My Computer. I am pretty sure my friend was able to use his flash disk few months ago, so I am not sure what seems to be the problem now. I have three available ports and have tried to plug my USB in all of those, but it is still not working. Restarted the laptop, tried it again, still no go.
I am no technical person, and do not know much about computers. Can somebody help please?
