I've just figured it out.
After I've manualy removed all saved files and started new game,those files poped back up. It's bcs the STEAM cloud synchronization. You have to turn it off, then delete those saved files(or the one corrupted, if you know which one it is) and after that, start the new game. Then it works again. At least for me.
edit: Don't switch the synchro. back again. It'll upload that corrupted file back to your folder.