How to restore Realtek/Dell audio manager plug-in prompt?

I have a Dell Precision 5530 laptop.  It's a work laptop with corporate management, so I can't install software or update drivers.  My corporate help desk could not fix my problem.  Looking for any DIY help with this:

I purchased a simple lapel microphone with a 3.5mm jack input to use with my laptop when I am not plugged into a dock.  I cannot use a USB mic because I have no more ports available and I am trying to keep my setup simple.

When I plugged in the mic, I got a prompt asking me "Which device did you plug in?  Mic in, Line in, etc."

I chose "Mic in" and the microphone worked fine, and audio still played through the laptop speakers.  Every time I used the mic, I made the same choice, it worked.  I got bored of making this choice every time, so I checked "Don't show this dialog again".

Today after a reboot, I find that the laptop must think the mic is a headphone.  Audio does not play through the laptop speakers, and it doesn't pick up input from the mic, it keeps the laptop mic active.

I think it would work again if I could get the "Which device" prompt back, but I don't know how.  I don't have any Start menu items for Dell Audio or Realtek Audio, and I don't have a c:\program files\Realtek folder.

Does that application go by any other names or locations?  Obviously it's on my laptop but I can't find it.

Again, it's a corporate build and I cannot install new software or drivers.

Thanks for any help!

Garrett