Trying to restore earlier version

Upgraded to version 3.7 boy was that ever a mistake. I have used Audacity for recording internal sound but 3.7 is flatline, no source sound. I made no changes to any computer settings when 3.7 was installed it just records a flat line with tiny noise signal. I am now unable to do any recording so I tried to delete 3.7 and reinstall 2.3 but now 2.3 fails with unable to open recording device. Is there any way to nuke all of the Audacity setting sin the computer so I can reinstall 2.3 and get back to work?

Delete (or rename) “audacity.cfg”, if you’re going back from v3 to v2 … Resetting Audacity | Audacity Support