Make sure you have selected the correct recording input (aka, not the microphone).
Check that you don't have multiple audio input devices ..
Start->Control Panel->Sounds & Audio Devices -> AUDIO -> Sound Recording (Drop box).
Check that you are recording the WAV audio input (not Line-in/microphone/CD-Audio/TAD-IN).
From there you will also need to pull up your Sound Cards Control Panel & select the right input.