Realtek drivers no sound present

I have tried many solutions and nothing works,i'm using windows 7,Procesor DualCore AMD Athlon 64 X2, 2000 MHz (10 x 200) 3800+, ASRock ALiveSATA2-GLAN (3 PCI, 2 PCI-E x1, 1 PCI-E x16, 4 DDR2 DIMM, Audio, Gigabit LAN),but my VT8237A High Definition Audio Controller doe's not work.
In bottom right corner speakee has a red x on it,when i go to device menager high definition audio controler has a yellow exclamation point. When i go into it properties it says This device cannot start. (Code 10). I've tried updating to many versions and nothing,no suond appears. Please people help me i'm desperate. I didn't do only flash of the BIOS because i do not know how(please step by step procedure). Contact me with your solutions here please.
Thanks Boris.

Just download the driver from realtek main site it should work.

You have to set your speakers inputs in realtek audio manager tho.

I downloaded them but it doe's not work,i can install them,then i have to restart and the same thing happens,no realtek.
(You have to set your speakers inputs in realtek audio manager tho.)
Where do i do this?

Please someone help!

Anyone help,problem still exists

After ur install the driver that ur download from realtek website..where ur plug the sound cabel??(the colour)green,yellow or what

And please fill the My system Specs..(for more detail)

Have you disabled any services?

I inserted it in to green,i didn't disable any services far as i know and i will fill out system specs now.

In control panel>administrative tools>services check to see if windows audio and windows audio endpoint builder are running.

They are both on automatic and started.