The Truth
The system reserves 20% of your band-width. Means you are paying your ISP for 100% , where as you are using only 80% of it. Cheated no....
How to free your Band-width
(1) Run -> gpedit.msc
(2) Local Computer Policy -> Computer Configuration -> Network ->QoS Packet Scheduler -> Limit reservable bandwidth
(3) Double click Limit reservable bandwidth
(4) Click Enable and set Bandwidth limit to 0 %
Now you will be able to use 100% of your Internet band width.