No kidding about internal software, called "sound recorder" (how creative).
Go to your "start" menu, then go to "programs, and come across to where It's hidden in the "accessories," and then "entertainment" menus of XP.
What's cool is that the viewing window they offer for setting level is the same color and waveform as an oscilloscope. So it will be familiar, eh ?
You can get into the advanced settings to create an uncompresed "wav" suffix file or others.
Here's one recorded last night on a basic laptop driven at mic level off the headphone jack of the open reel machine on which it was originally recorded off the diode load of an R390A.
http://wa3vjb.amham.com/sound/AudioHell.mp3