Have you got all of the latest updates for Windows 10? Have you also restarted your PC and tried running Galaxy again?
No, Windows 10 updates don't install on Windows 7. :) But yes, I have Windows 7/x64 fully updated prior to the Galaxy update. Galaxy would not start up at all, including after a reboot though. I had to uninstall it, download the installer and reinstall it, then re-import my installed games and it worked properly. It updated itself again and seems to work still.
Ah right, I forgot you had Windows 7, my bad :) So everything is working for the time being, right? :)