My sound card is onboard (MSI-MS 7693), and always will be detected automatically by windows after re-installing windows (Detected true driver: RealTek), its been a week every time i power my pc on, after login to windows, it starts detecting wrong audio device (it detects nVidia High Definition Audio instead of RealTek) and try to install it and every time fails, and result is i have no sound! what is problem and how can i solve it? re-installing windows is a real mass and i try to avoid!
Try clicking on the button down right on the taskbar, where you can set the volume. Open, and click on "mixer". In the "Device"-area, you can click on this dropdown menu and choose between the outputs. Choose your Realtek driver there.
Similar to RnBandCrunk answer, but I suggest right clicking on the speaker symbol in the task bar (near the clock) and selecting playback devices:
Under the playback tab you will see what is available - select the device you want to use and set it as default.
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