I can not install Realtek

So your motherboard is AsRock M3A770DE.

If you did a google search, you will find that your motherboard uses the following as sound that is NOT Realtek:
- 7.1 CH Windows Vista Premium Level HD Audio (VIA VT1708S Audio Codec)\\

You will need to go to the manufacturer's website (ASRock) and download the appropriate drivers from there as a start. You might be able to find more up to date drivers through Windows Update or somewhere else but at least download the drivers from ASRock for now.