Hi I know that you can use a multitrack to record onto a pc. Using the PC as a multitrack. However I am not quite sure how to di it? Any help would be much appreciated

Hey guys. This is probably a stupid question but possibly important to me.

how can I reduce the noise caused [internally] by the computer? I know it's not the room or nothing because if I plugin some headphones and turn the volume all the way up [without playing anything] I can hear the noise. I'm trying to record some vocals through the mic-in jack.

I am looking to upgrade my computer, and have been thinking about getting a laptop to replace my aging desktop. Anyone have any experience with recording on laptops? I am looking to be able to record 10 or more tracks simultaneous, but I'm not too worried about loading up on plugins or virtual instruments. Also, I am probably going to stick w/ PC. Will a 1 gig P3 be able to hold up?

I am looking at uprading my current DAW setup but there are so many factors to consider since the tecnology is changing so fast . I am currently running :

MAC 9500/G3 400
OS 8.6.1
Pro Tools 5.0
Pro Tools III Hardware ( 32 Track )
(5) DSP Farms
(4) 882 I/0
Miro DC30+