Did you know that Windows XP Quality of Service function (QoS) reserves up to 20% of the available bandwidth - even when you have disabled Qos in the network settings. To restore the full bandwith to all settings follow below :
Log on as administrator.
Start 'Run' and type in "gpedit.msc" - the Group Policy window will open.
In the right window expand the "Computer Configuration" branch (double click).
Expand the "Administrative Templates" branch.
Expand the "Networks" branch.
In the left window where the file tree is highlight or select the "QoS Packet Scheduler"
In the right window double click "limit reservable bandwith" setting. This will bring up the properties window for this function.
On the settings tab select "enable".
Where it says "Bandwidth limit %" - change to 0 and click apply.
Exit gpedit.msc.
You'll need to reboot for change to take effect.
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