Yeah just read about that tried it but its stuck on 30% again.
Could always try this -
How to perform a proper, clean reinstall of Steam:
Write down your Steam Account name and password - you will need them to log back into Steam once you have reinstalled
Logout of Steam if you are able to do so
Exit Steam
Move SteamApps out of the Steam folder. This is the folder that holds your games so you want to keep it!
If you are having problems with a specific game, delete its folder from SteamApps/<account> - Uninstall via Add/Remove programs, if you can
Restart if prompted
Delete Steam folder if it still exists
Hit windows key + r ( run at the start menu ) and type regedit
Delete HKEY_CURRENT_USER\Software\Valve and HKEY_LOCAL_MACHINE\SOFTWARE\Valve (or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Valve on 64-bit Windows)
Restart
Download and install a fresh copy of the Steam installer from
http://www.steampowered.com/download/SteamInstall.msi
Run the installer
Exit Steam before you first login
Move your SteamApps folder back
Run Steam.