Soundmax HD audio: Stereo Mix + Mic

[gu-val]

Hello there, I have a problem with streaming video+audio live.
The problem is, I need to put both wave output (game sounds, music, other things I hear) and Mic output into the recording channel.
I have HP probook 4510s which uses SoundMAX Integrated Digital HD Audio soundcard. Windows XP driver version 5.10.1.7265. HP site doesnt have any newer driver for this device, afaik.

Normally, I would tick both "Stereo Mix" and "Microphone" thingies in the recording control, as with my another PC (desktop one, soundcard realtek HD or something), but it works the other way around on laptop. It allows me to choose only 1 option (mix or mic) and whenever I try to check one, the second becomes unchecked.

Is there a way to check both? Maybe a driver upgrade/downgrade, or modify it somehow.
Please dont suggest me software solutions like VAC or similar, but I would really appreciate your input about driver issue.

Sorry about bad english.

[gu-val]

update: I've also tried installing driver 5.10.01.6110 or something, but it didnt work for me (said cant do with my hardware). Apparently there are two official versions of the driver for my hw: 5.10.1.7240 and 5.10.1.7265, with 7240 being the initial release.
Alike from "normal" soundmax or realtek driver, this doesnt come with a control panel so I'm limited to use of default windows one, and I cant check both boxes there. Does that mean it's no way?