Whenever I try to record using my line-in or mic-in on my computer, I get this weird interference noise. I can even hear it when I crank up my volume outside of the audio programs. I have an integrated audio controller (Soundmax; Asus M2N-SLI Deluxe motherboard). I know it isn't the greatest thing for recording, but it's all I have right now. Is there any way to fix it, or should I just save up and get a dedicated card or external audio interface?

Here's a clip of the noise: http://profile.ultimate-guitar.com/guyperson/music/all/play500717

For reference, here are my computer specs:

Custom built

Windows XP Professional SP2

A-DATA 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)

Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive

ASUS M2N-SLI Deluxe AM2 NVIDIA nForce 570 SLI MCP ATX AMD Motherboard

Rosewill RP500 ATX12V v1.3/ EPS12V 500W Power Supply

AMD Athlon 64 X2 6000+ Windsor 3.0GHz Socket AM2 125W Dual-Core Processor Model ADX6000CZBOX

EVGA GeForce 8600GT 512MB

Samsung DVD-ROM Drive

LG DVD Super-Multi Drive

Samsung 250GB SATA Hard Drive