Audacity 1.2.6

I have downloaded and installed Vers 1.2.6 and registered the program. However listening to e.g. King FM in the computer  I cannot record the sound I hear in the loudspeakers. Using CD, Line etc does not work. Stereo mix creates a terribble noise. Recording with the program 'Total Recorder' works without any problem.
Please what to do? WvS Sweden.