No sound

I've recently installed Windows 7 on my system and at first everything was ok, but after I restarted my pc, the sound was gone. I checked device manager, uninstalled and installed audio drivers again and the sound came back again. After another restart, the sound was gone again. This happens every time I restart my pc.

Could someone help me with this? It's really annoying to install audio drivers again and again and not all my family members know how to do that :/

I use realtek via hd audio or something like that.
That's what ubuntu showed me:


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