This just fixed it for my friend with AMD card, he only had to rename the galaxy.dll file, it works now.I was able to resolve the issue by following the steps below from the FAQ:
1. Uninstall Galaxy
2. Open command line (Start->type "cmd" -> right click "cmd.exe" and click "run as administrator")
3. Type sc delete GalaxyClientService
sc delete GalaxyCommunication
4. Go to //gamedir\bin\x64 and rename or delete galaxy.dll
5. Launch the game, an error message will pop up, but the next time you start it everything should be fine