Sorry another question for audio/HDMI

Hi folks,

I'm Tim from the netherlands and a new member and BIG fan now off Xbmc!
I'm a IT Specialist but never in my life i heard off Xbmc! i cant figure out why!
Because its freaking HOT!
My big hobby's are audio and movies!, and stil...just found 1 week ago from a friend this software!
First i would like to give all the people who put time in this great piece of software a big thumb!

Well then my question ..

Yes i know some of linux/debian/unix/windows because its my work but i dint get xbmc to work with my hardware right now. so i installed windows 7 pro 64bits and works fine but i dont get DTS HD Master.
Heres my hardware:

(temporary hardware dont have budget right now to buy a minipc).

Laptop Compaq CQ60204ED
CPU AMD ATHLON 2core 2ghz 64bits
GPU NVIDIA 8200M g
4GB ram
40GB SSD intel disk
Amplifier AVR: Harman Kardon AVR255 --> to Samsung led tv.

I tryed alot of versions of xbmc and right now i use the nightly build of 7 november 2012.

When i play a movie in Xbmc thats have DTS HD master i only see DTS in my AVR.
When i go to windows and setup the speakers in hdmi audio i setup the 7.1 speakers set.
But if i look what is supported i only see dolby digital in settings hdmi audio.

Strange thing also is when i use new Nvidia drivers i dont get HDMI to work anymore. no screen no audio.
For some reason alot of people have this problem with geforce 8200m G.
I managed to install some newer drivers of hmi audio but no DTS HD master in the AVR255.

What do i do wrong? is my hardware not suporting the DTS HD master and Truehd etc?
Or is it a driver thingy and you gonna give me a link what i can try?

I read alot of pages but dont manage to get this to work.
I tryed also other output audio settings in Xbmc like wasapi? hdmi and directsound hdmi (wich is better?)

Sorry for my type mistakes .

greetings,

Tim

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o and if i test the 7.1 speakers all the speakers are responding in hdmi audio settings. (i have a 7.1 set)