Crashing when trying to patch/repair

While patching the game cause my computer to crash. When I was able to get back on i tried to repair/reinstall. It did the same thing again. I am not sure what causing it and any help on fixing it would be appreciated. I am on a window 7 computer and sorry for not a lot of information. I dont t know much about computers and this is the first tine i have ever had a game do this.