Originally posted by Ptolemy:

If your game data's gone then you have no option except to restart... and you can turn Steam Cloud off by opening Steam and clicking the Steam dropdown > Settings > Cloud > unticking "Enable Steam Cloud synchronisation", but if you're playing on public computers then I don't know whether this is a viable option for you. You can probably make a backup of your game files onto your own cloudshare whenever you're done playing a game so that you have a copy of them even if Steam Cloud decides to revert them, though.

damn ,im not good at computer ,so i need to brought an external hardisk everytime i want to play ?