There's a good chance it's nothing to do with the graphics hardware, and instead it's your CPU hanging. TB does a heavy mod download when it's run, and in the majority of cases the game will "freeze" for a few seconds while it does it. Celeron's were never great, it's likely the game hasn't locked up etc, it's just taking it a longer time to do it. (Windows goes DERP if something takes longer than it thinks it should & gives you a lock up message)
Or it could be the graphics, the only driver Toshiba released before discontinuing that machine is over 3 year old. You could force it to have an intel version, though I can't guarantee it'll work. But hell, that's what the rollback function on Windows is for eh? ;)