What game are you talking about? TSW plays quite a few games together, it seems. If is Allods, which had something similar happen not to long ago, you may still have had the CB client still installed. The OB client required a fairly small manual update with the instructions:
Close Patch Client -> DL Updater -> Reopen Patch Client -> Run Updater(with patcher open) -> Wait for update to finish -> Reset computer(a lot of people needed to do this, it seems) -> Enjoy
If it was something more recent, I know nothing about it. If it is some other game, likewise.