Advise needed

I updated Zoom on my personal laptop a month ago and lost the microphone capability, and the app. I now use a USB attached microphone for my Zoom calls, and have to open a downloaded Zoom folder when I want to use it.

I updated Zoom a week ago, and when invited to a Zoom my camera was not working, in addition to having to use a USB microphone.

How can I get my microphone and camera features back?
Can I ever get the App back, so it's easily accessible?