Windows uses 20% of your bandwidth

A nice little tweak for Windows XP or Windows Vista. Microsoft OS reserves 20% of your available bandwidth for their own purposes (may be for updates and interrogating your machine etc..)
Here's how to get it back:

Click Start-->Run-->type "gpedit.msc"

This opens the group policy editor.

Then go to: Local Computer Policy-->Computer Configuration-->Administrative Templates-->Network-->QOS Packet Scheduler-->Limit Reservable Bandwidth

Double click on Limit Reservable bandwidth. It will say it is not configured, but go to 'Explain'tab and you will know the truth:"By default, the Packet Scheduler limits the system to 20 percent of the bandwidth of a connection, but you can use this setting to override the default."

So the trick is to ENABLE reservable bandwidth, then set it to Zreo.
This will allow the system to reserve nothing, rather than the default 20%.
I have tested on Windows XP,Windows XP Pro and Windows Vista Beta 2 and rc2(currently using) also.
Please give me feedback about your results also.