Turn off the firewall anyway just to try. If it's updated, it won't be recognised as the same program.
I'd also check the host file for anything odd.
If it's not that, then it probably is the router. Is there a router? Do other PCs in the house have access to MSN? If so, changing her IP address may get around any deliberate block on her.
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When you're feeling too silly for x404,
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