- Go to Start, Run and type: gpedit.msc
- Expand the key "Local Computer Policy"
- Expand the key "Administrative Templates"
- Expand the key "Network"
- Scroll to the left "QoS Packet Scheduler" and double-click to open
- Locate the "Limit reservable bandwidht" and double-click to open
- In the new window, select "Enable" and change the rate to 0 (this is on 20 default)
- Restart your computer
The 20% of the bandwidth that Windows XP reserves for itself are now available to the user