Desperately need help with sound recorder tweaking

I'm so sorry for posting this off topic. I just dont know who else can help.

I've got exams in 2 weeks and they've posted the "notes and lectures" online, and you need to wait your turn to access them because so many other students are slowing the bandwidth down.

When i finally get access. I ought to record down the lectures with some sort of sound file. Im using a PC and i have sound recorder. I need to record the lectures myself, so that i can access them whenever i want.

Can anyone teach me to tweak my sound recorder so i can just record whatever my PC hears from the internet??? SO far i can get it to just simply record.. but it also records my room and my breathing and stuff.. I need help.

Charles