yes.. sure. I am thinking about getting a technique to help me with this because I don't want a microphone that's not built-in, and have to approach my mouth to the microphone to talk. It looks ridiculous, specially when video-chatting.
Any decent mic at all wouldn't require you move your mouth to it to talk, and would probably give better sound quality then the thing built into your computer.
But if getting a new mic is out of the question, there has to be a driver somewhere for that mic that would work with windows 7 unless the laptop is absolutely ancient.