Took over a business computer running Windows XP Professional Version 2002. Trying to clean it up and install new things I needed, was prompted to install MS Service Pack 3. Did that, and ever since computer is SO SLOW and then screen often goes black, then comes back on. Is this related to SP 3 or is this something else??
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The screen blanking out on you could be related to the video driver.
There's lots of things that can bog down a computer. Without knowing more about what's going on when it slows down, and hardware specs, suggestions would just be guesses.