I recently bought a new Windows PC which came with pre-installed software.
But in start menu there's still the WPS Office folder, empty, with a blue square icon (instead of the classic folder icon), so apparently "bugged", but being able to right-click to open its Microsoft app page and other stuff:
So I opened regedit (I am not very good with Windows PC, so at that point I was just trying without knowing exactly what I was doing) and deleted every single reference to WPS Office and Zhuhai-Kingsoft (which appears to be the name of the developers)
Previously, I scanned through C: drive (partition) for those keywords and then deleted everything. After a system restart, there were no tangible trace of WPS Office if not in the start menu, still here as always. I really don't know what to do to get rid of that. Also, I obviously searched for all appdata roaming/local subfolders, where I usually find start menu folders.