Microphone not detected

For the past two months I have been receiving a popup stating the my microphone is not detected. At this point no one can here me and I lose all Zoom controls. I have been advised by Zoom to uninstall and reinstall. I have done that three times. Zoom has sent a cleanup package that has proven ineffective. 

I have a brand new Dell computer and a brand new Logitec camera/microphone. This problem has occurred FOUR times over the last eight days alone and is causing me to miss and drop out of NECESSARY meetings. Someone PLEASE help me fix this problem. I just received my latest invoice from Zoom so I know someone is working, at least in the billing department.