Can't connect to Steam Client

Try deleting clientregistry.blob

Try again, worked for me after a few tries

If nothing happens when you try to open Steam it can be that the process is still running, close it from the Taskmanager.

servers had problems and maybe still have

I just connected to steam easily, without any problems, check your firewalls?

Working fine here. Try to shut it down and start it again

^Winnings must be redeemed on the winning account.

may be not the case but it happened to me when the hard disk was almost full