Webcams on Laptop computer

I've been trying out a fairly new webcam on my laptop so that I can put a video of the playing of a NAF, and it just wouldn't work! Don't know what the problem is, and I tried it in 3 different USB plugs!

Did a virus scan and it came up with a Trojan - of Generic title. Hopefully I fixed the problem and I'll have a video on this site shortly. Does anyone have any hints to making a decent clip?