Verified answer

Yeah try what he said, shut down your anti-virus programs (not necessarily shut them down, but turn them off or set their filter).

Also, once you click on it, assuming your talking about the part where you begin installing, "Please Wait" will pop up and stay there for a few minutes. Be patient.

Shutdown Kaspersky.

sro_client.exe is recognised by many antiviruses as a rootkit. Don't worry though; it's not. It's just that the way GG hides it's own process looks very suspicious to antivirus programs. I had the problem you are describing all the time back when I used to play and I used Kaspersky.