inspirion 5100 lockups

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My nieces laptop (inspirion 5100 wiht ati radeon 7500 video) just locks up.
She has to disconnect power and take out the battery to shut it down.  We
have installed the latest video drivers from dell.  It seems to work fine
until she connects to the internet and is worse at school (Florida) than at
home.  Any thoughts?  I heard something that the ethernet chip driver may be
flaky. Thanks for any assistance.

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