Logitech webcam

Hey, I have bought a Logitech webcam from a relative. there was no cd or
manual with it. I thought by just pluging in the webcam via usb port, it
would work. When i logged onto msn and tried it out, there was nothing going
through although it said it was connected.

The numbers on the tag are
P/N 861154-0000
S/N LZA34704767

I have windows Vista with a AMD Athlon(tm) 64 X2 Dual Core Processor 6000+

any help would be greatful.