Microphone auto muting and the levels go down to zero

My mic mutes itself when I use the Blackboard program.  bb.collab.com.  I get a popup message in Blackboard that states The microphone has been muted by another application.  Do you want to unmute?  This only happens in Blackboard.  I can play music, I can watch youtube etc., and don't experience this.  I have searched through every application on my computer, on google, on FF and IE and cannot find which application is doing it.  I have used a different head set and it still does it.  I have tried other computers and I don't have this issue, so I know it's not Blackboard.  I tried your troubleshooting step, but I don't see a host folder you have discussed.  I have Windows 7 professional.  Does it have a different name on Windows 7?

Hey TechRaj! Your video was extremely helpful! I cannot thank you enough for being the rock in the hurricane when I had this situation. I've had this issue for quite awhile now, but your video was straight to the point in showing me how to solve this pretty annoying problem. The only really annoying part is that Malewarebytes takes a long time to scan and quarantine threats.

Hello, a little while ago I bought an old (but good) PC from a mate. Windows 10. I have a wireless Logitech gaming headset G933. AT first it was fine, then whilst in Discord I found that at random points my friends couldn't hear me. I would then have to disconnect and reconnect. At first I thought this was Discords fault. It wasn't until after I searched a way to fix the solution that it was my PC that randomly muted my mic. Here's the thing, It's connected and would be working fine, until it would randomly mute itself. When I open "sound" > "Recording" It shows that my mic is connected and set to default. However, when I speak the green bars don't appear. Now I have almost searched every where for a solution, and I found one. I go into Device Manager > Audio inputs and outputs and delete my "Microphone (Logitech G933 Gaming Headset) driver. I then have to restart my PC which I'm sure it then re-installs the driver and everything seems to be fine. A week later the same thing happened, I did the same thing, it worked, the next day is stopped working again. At this point I'm sure its going to continue to happen. Please ANYONE HELP ME!!!