Posted June 22, 2018
3DMaster: I had to reinstall windows; but my games were on a separate disk so they don't really require reinstalling. However, the Galaxy client doesn't automatically detect installed games in the games directory. Is there a way to manually tell the Galaxy to see if any games are installed, or do I have to reinstall over the games?
Don't reinstall your games. :) Click the GOG-logo menu on top-left and choose "Scan and import" option. Point your games disk/folder and then please wait patiently. :) You can also import game-by-game going through your library -> Game View -> MORE -> Manage installation -> Import folder.
It's probably better written here: https://support.gog.com/hc/en-us/articles/212185389-How-do-I-import-already-installed-games-older-versions-or-installation-files-into-GOG-Galaxy-