Can't do anything with Audio Capture Sources

[JulyLynn]

Errors

Attempting to play any graph that starts with any Audio Capture Source results in this error:

E_FAIL (0x80004005)
Unspecified error
Error starting playback (decimal -2147467259)

GraphEdit gives a similar error:

This graph can't play.
Unspecified error (Return code: 0x80004005)

I run Windows 10, on a 64-bit system. l've tested both the 64 and 32 versions of this software and noticed no differences. l've tried using my computers internal line in & mic in, 2 usb audio devices, and a sound card's line in & mic in.

Background

I'm pretty new to this program and have been trying to follow this tutorial when I ran into these issues; but I'm up to learning something new, so I've been intermittently researching it for the past few weeks. Despite this, I have not found anything too relevant to this issue yet. Does anyone know what kind of stuff could cause this? or at least give me a direction to go in.

[rdp]

What audio capture source is it?