Did you install through Software Center? If so, go back to Software Center, Installed - top middle, then scroll down to Zoom (alphabetical order) and click the 'uninstall' button on the right. Looks different than the MS store but, same functions really. There is a version of Skype for Linux, btw..
If you're looking for a Windows installation guide: this should have all you need for reinstalling Windows - has both 10 and 11 versions.
And have to ask.. what is the '200 dollar blunder' about?