Try installing SM on the computer that you have now, if an error comes up, or it crashes, take a screenshot and post it. I used to have a video card problem on my older computer, and got it fixed in a jiffy =)
Just find out what brand of vid card you got. ie ATI or Nvidia, go to the website. Read install instructions. It's important to uninstall old driver 1st > restart > and install new one >restart = done.
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