I marked resolved as even though windows said not installed and REVO said not installed, I found a link to modify in the apps section for vs2015 and ran it and then selected uninstall.
I am glad vs2015 is gone off my system.
for some reason it again took a long time to uninstall and freed up 6gb.
The IDE was extremely laggy, as in type in some code and it took several seconds to appear.
VS2022 does not do any of that. in that sense it is better, but without linking help on the web, well, they dd not design it that way, but it is what it is for reasons unknown.