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I have a Gateway Version 2000, model # performance 866. It has 996 MHZ, 512 MB of Ram. It had windows 2000 professional loaded. I had loaded windows xp professional service pack 2. It did not lock up for six months, worked great. But now when I am on line, or on msn messenger the computer locks up. I have cleaned out any dust in the computer. I have ran system mechanic . Also checked for viruses. Now I'm at wits end of how to stop this computer from locking up. Where do I go from here. Please help.