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This error occured because of invalid registry value, to solve this
1. Open notepad
2. Copy this code
3. Save with extension .reg
4. Run the file

I always get this error when playing and disconnected and trying reconnect in dota 2, to solve this:

 - I just restart my modem, and it's done

but maybe take some time to get the internet back -_-

even you run as administrator, u won't start the game, it's just about tages, so just download and install this http://www.tagesprotection.com/5.5/TagesSetup.exe (for windows 32 bits), http://www.tagesprotection.com/5.5/TagesSetup_x64.exe (for windows 64 bits)