Microsoft reserves 20% of your available bandwidth for their own purposes like Windows Updates and interrogating your PC etc. Don't you want to get it back for your self? Here is the trick how to get 100% of your available bandwidth.

To get it back:
Click Start then Run and type "gpedit.msc" without quotes.

This opens the "group policy editor" and go to: "Local Computer Policy"

Then "Computer Configuration" Then "Administrative Templates"  

Then select "Network"  then "QOS Packet Scheduler"

After that select "Limit Reservable Bandwidth".

Double click on Limit Reservable bandwidth. It will say it is not configured, but the truth is under the 'Explain' tab i.e.” 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 ZERO. This will allow the system to reserve nothing, rather than the default 20%.

 Note:

After discussing with many Microsoft guys I would like to make changes in the above post. So here is the revised post. I apologise  for misleading information. So I am correcting the above post and rewriting it.

If you're running a bunch of applications and at the same time you're doing a Windows
Update then 20% of the bandwidth will be reserved for Windows. If you're
not doing a Windows Update or equivalent then 100% of you bandwidth is used
for whatever you're doing. It's NOT like your only getting 80% of your
bandwidth because 20% of it is reserved for some system update.

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