If you haven’t already done so, please try to adjust TDR-related (Timeout Detection and Recovery) registry settings. These can be found by running regedit.exe and navigating to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers. If the settings (keys) are not there, they have to be created (with type REG_DWORD).
The first option is to increase the timeout threshold by setting TdrDelay to a larger value (e.g. 10). If this doesn’t help, TDR can be disabled altogether by setting TdrLevel to 0.
Reference: http://msdn.microsoft.com/en-us/library/windows/hardware/ff569918(v=vs.85).aspx