Need help! laptop freezes

Hello z8/crossfire players/forum members:

Well i've been playing crossfire on my brother's laptop for awhile. It is a windows xp home professional. But after a few minutes into a game the laptop freezes for no reason. I have very good high speed internet however the laptop lags. I changed the compatibility mode to windows 2000 but still nothing. Can anyone please help me? Any suggestions are greatly appreicated. Thanks! :)

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