Try to specify different Video Format properties manually ('Video Capture Device' source, OBS Studio) - you need to set Resolution/FPS Type to custom and setup resolution (640x480 or lower) first.
I think, your camera hasn't proper DirectShow support or you are missing some driver/filter.
1. Can you find model of your camera?
2. Camera has build-in mic?
I'm second to Mroczny_Gustaw, try different system (7,8, both x86 and x64).
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