USB Flash Drive suddenly stops working

Hi, guys, I'm the newbie from the Philippines. I'm really worried about my USB Flash Drive. I've had it for 5 months now, and I use it on a lot of computers, whether they're Windows 2000/XP, and it always worked well.

Just 2 hours ago, I plugged it into one computer and it worked well. But a few minutes afterwards, when I plugged it into another computer, it wouldn't light up. I plugged it into other computers, including mine, afterwards, and none of the computers read it.

My roommate's USB Flash Drive, however, worked in the computers I plugged my flash drive in.

Does this indicate that I'd have to buy another USB Flash Drive? Is this the work of a virus or just plain stupidity in my part?

Please help me.

if its any help

By the way, if its any help, my USB Flash Drive is 128 MB, Canon, Transcend, 2.0