Try this:
Make sure no SketchUp is running. (Perhaps restart your computer and do not start SketchUp.)
Locate the downloaded installer file of SketchUp 2022, or download a fresh copy of it from here: (https://www.sketchup.com/download/all).
Right click on the installer file (SketchUpPro-2022-0-354-126.exe) and chose Run as administrator, allow UAC to execute then chose Repair when prompted. Wait for the installer to finish.
Perhaps restart your computer.
This should allow to associate .skp files to SU2022.