Vista - Big Sound problem (need help soon please)

k heres the deal....
I've had my new computer built for 3 days now. Ever since i have had it i have had no sound.
I've searched endless forums looking for ppl who have had similar problems trying to resolve mine.
But no luck so i finally gave up and decided to write about it.
K so the problem is the error that hunts my new pc "No Audio Output Device is Installed"
-my audio is realtek hd audio-
yes, i have tryed installing the driver from my motherboard disc..and yes i have trying getting updated drivers...this does not help...
the reason..
when i go to device manager .... i have no Sound, video, and game controllers tab !
WTF? .so that is what i need to fix first and then i thinkk i can fix sound by installing drivers.

Comp Specs=(also in my dxdiag attachment)
Operating System: Windows Vista™ Home Premium (6.0, Build 6000) (6000.vista_gdr.080917-1612)
Language: English (Regional Setting: English)
System Manufacturer: XFX78I
System Model: XFX nForce 780i 3-Way SLI
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel® Core™2 Quad CPU Q6700 @ 2.66GHz (4 CPUs), ~2.7GHz
Memory: 4094MB RAM
Card name: NVIDIA GeForce 9800 GTX/9800 GTX+

Sound =(

Sound Devices
-------------
Description:
Default Sound Playback: No
Default Voice Playback: No
Hardware ID:
Manufacturer ID:
Product ID:
Type:
Driver Name:
Driver Version:
Driver Attributes:
WHQL Logo'd:
Date and Size:
Other Files:
Driver Provider:
HW Accel Level: Emulation Only
Cap Flags: 0x0
Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX™ 2.0 Listen/Src: No, No
I3DL2™ Listen/Src: No, No
Sensaura™ ZoomFX™: No

Please Help mates

do you have your onboard audio enabled in the bios?
should be under integrated peripherals.

thx for trying mate
but no it was set on auto =\

ok, have you scanned for hardware changes in the devices list, the sound, video and game controllers options wont come up unless there are any in your system.

With the HD audio drivers...you have to install it twice...the first time removes the current driver and the second time installs the driver.

If you forget the number of times you installed you may accidently just have no drivers installed

k i will try that thx

...yea nothing mates...
still no option w/ sound
and icon of no audio device installed on task bar

hey i got it to work manually but now i have this

http://img19.imageshack.us/my.php?image=problemx.jpg

hehe, wait a sec, i got the solution on a plate for you, type in the start menu search bar, "services.msc" without the speechmarks, and hit enter, this will bring up a UAC prompt for the microsoft management console, continue, and near the bottom of the list, can you tell me what it says next to windows audio?
make sure the service is saying started, if it says its stopped, then on the left, click on start this service as illustrated below, and set to automatic by right clicking windows audio and set to automatic.
also make sure the windows audio endpoint builder is the same as windows audio.
Restart your system and enjoy glorious High definition audio

Yeah bro i went on their and look where you told me, but both things are turned on, started, and automatic
Here is SS:

I would try a repair install of Vista, you may be missing some DLL or something.

well, ive looked at a few similar problems to this and the solution appears to be to uninstall your device completely from the device manager, restart and let windows install it, good luck.