sounds like tcp/ip. you may need to uninstall/re-install the tcp/ip protocol on her system.
your network probably doesn't use tcp/ip to handle ms shares and printing (i think you can set it up to use tcp/ip, but the default is netbui or some ms network sharing protocol). that is probably why shares/printing still works while explorer doesn't.
temporarily installing firefox might help determine if its an explorer or protocol problem.
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