Vista Stereo Mix

Okkkk, I need some help.
When it comes to on screen recording I have all the good software I need, good mic, all that junk. My voice sounds nice and what not. But I want to also have the sound of what is going on onscreen without have to let it echo into my mic from my speakers. I found out that on Camtasia I can let it record both my mic and my "Stereo Mix." Here is the problem, my vista apparently doesn't have a stereo mix. I've already looked in disabled devices and everything. I updated my drivers and even then I didn't get a stereo mix under my recording tab of devices. Anyone have some sort of a remedy to this problem?

Compaq Presario CQ50-115NR is the model of my laptop. My sound drivers are Connextant High Definition Audio or something like that.
Much help would be appreciated.

I think trying yahoo answers is better than southperry o.o

Tried that,
all they tell me is OH HUR DUR THEY THINK YOU TRY 2 PIRATE MUZIC or DERP RIGHT CLICK SHOW DIZABLED DEVICEZ.
I've looked around, this was my last option. ><

I had the exact same thing, but when I plug in my stuff, it works by itself. O_o Whatever you're using the mic with, it should have a "microphone" or "Vista Audio" setting. Switch it to one of those and try.

Well, what I'm doing is.
1- Recording Game Play into an AVI with Camtasia, that records my Mic and what's on screen
2-Recording the background Audio
Doing this because if I let the sound echo into my Mic from the speakers on my laptop it sounds really bad compared if it just had it record at a low volume below my mic.
It's not terribly needed, I just want this video to be notsonoob.

Check to see if you have "Vista Audio." You SHOULD have it and that's your "stereo input" thingy. I had that problem with XFire Broadcasting, too. I switched to Vista Audio for the video audio selection and it worked wonderfully.

Vista is annoying, it doesn't allow recording from stereo mix ( as far as I can tell). I ran into the same problem a few years ago too. Had to use some third party thing. W7 allows you to do it.