Is this still this 'beta' version you were talking about the other day, PWS? If it won't update, that will cause problems, but I don't know if would cause the problems with your games.
You could try re-installing it, and you may need to run Live Update several times before it gets all it needs. I believe the Common Client is ccApp.exe, and it sometimes takes several consecutive Live Updates to get it up to date. Don't know why, but that always seems to happen to me, whenever I install Norton Anti Virus and Firewall. I suspect, however, that if you only have the 'beta' version, it had a limited lifespan, so may well refuse to re-install.