While I agree that 56k isn't a great connection compared to high-speed, that is probably not the problem.
Check to see if your Windows XP firewall is activated. If it is, disable it. Also disable any other firewall software you may have.
If that doesn't work, contact your ISP because it is a problem on their part.
__________________
With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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