There are a lot of point&click games in Steam, some are free. Steam shows also the min sys specs to use them. https://store.steampowered.com/search/?term=free+point%26click&maxprice=free&tags=1698
In Itch.io you also will find a good collection, also to play direct in the browser https://itch.io/search?q=point%26click
Other with a nice collection of point&click in Html5, which you can play for free, just in your browser. https://gamaverse.com/point-and-click/html5/
I think that in a old low end PC search for Html5 games are the best solution, this avoid to fill your HD with games which maybe don't work or not are what you want. In browser games, if they work, fine, if not, try other one No trash in your PC, only maybe a temp file in longer games..