Well, to be honest, you can torrent a copy of windows and use NLite to get rid of stuff you dont want. Also, you can check the MD5Hash on the downloads to make sure its a legit copy of windows. If it has been changed in anyway it will not match. That is how you make sure something that is pirated like an OS is good.
As, for the laptop running that hot, that means something is wrong. A simple file will not cause this. If you continue to run the laptop like this without correctly fixing it you will only cause more damage to the board and the CPU. In most cases if its running that hot the fan has gone out. Also, certain models have certain problems. I would make sure you have it checked out before continuing to run it or eventuall you will just burn it up