I don't know how to captrue it directly from it's ource but a guaranteed way is to use either the simple recorder in Windows and record it in "real time."
I have the cd burning program called NERO which has a recorder as part of it's software package.
There are also some freebie programs to be found on the net. If you go to any search engine and put in some keywords like "free wav recording software" you should find one in a jiffy.
Good Luck!
Thank you for the good advice!