First of all, you won't need to connect the BR to your receiver. You'll connect the audio outs of the BR directly into the line in on your sound card. If you'd like you can connect the receiver to the output of the sound card so you can monitor what going on (or just use headphones). Now all you need is a program capable of recording. Windows itself has a sound recorder in accessories which will work, but is a very basic recorder. If you're looking at doing some higher quality work you'll probably want to get a good wave editor (GoldWave comes to mind) and use that for recording and editing. Either way the file you'll end up with is a *.wav file and you'll be able to burn that to CD.
The preinstalled sound card in your machine is most likely nothing special, but it will work for what you're trying to do. For higher quality work you'll probably want to purchase a bit of a higher end card (there's lot of choices out there). To find out more info on that card go into device manager and take a look at Sound, Video and Game controllers. Here you'll find the name of the card (listed as __________ audio driver). Now you can do some research online and gets the specs of the card.
Hope this helps.
Stray