Recording Stereo through Microphone Input without audio enhancemen

I have an HP laptop with vista on it. I also have Cooledit Pro 2.0 as my

recording software. In the past, my computers (all on XP, I go this laptop

for college) had no problem with me plugging my guitar into the microphone

input and recording, but with Vista, the audio enhancement will change the

volume of my input while I'm playing.

I found one way to counter this was to un-check "audio enhancement" but if I

do, it only records in mono, which is not what I want at all.

Please help!