Make sure you are plugged into the microphone jack on your computer. open up your windows sound recorder from Start - Program - Accesories - Entertainment. Hit the record button and play your guitar. You should see recorded sound wave in the middle of your sound recorder. If you do not see the recorded waves this might mean that your microphone is turned off. To turn it on just Double click on the little speaker icon on your taskbar at the bottom right of your screen. The volume control window will open. Click on options then properties. Next check the small round recording button. Now make sure the microphone box is checked then click ok. Now a window will open that will show your microphone recording level. Move the slider up about half way and make sure to check the small "Select" box near the bottom of the slider. Open up sound recorder and try to record again. If this does not work add a comment to this post. I have recorded my guitar on my PC many times using just the sound card that came with my computer. I am sure we can figure this out.