Motherboard

Hey I had a motherboard die on me and I don't know what kind of processor it is or where to buy a new motherboard. the Processor is a Pentium four 2.6ghz, I don't know what kind of socket it is. So what is a good store to buy from and how can i identify what socket the processor is?

I have no idea where else I can post this question.

Is there a program or method that let's you save embedded video files?

I remember seeing a way to do it before but I either forgot what it was, or I made it up and it doesn't actually exist.