I would reinstall Windows, especially if the current installation is old. As long as you can connect all the drives to your computer, you can move files from the old disks. If the games on F: and G: are on Steam or Epic (and other similar launchers probably works similarly), it’s easy to move the games around using those launchers. Games that have been installed outside of such launchers might not work if they are moved to a disk with different drive designation or if they are moved to a new Windows installation.