Do you know that about 20% of your internet bandwidth is reserved by Microsoft ?!
Uses of Reserved Bandwidth
> Windows Automatic Updates rely on this reserved bandwidth.
>Fast loading Microsoft Websites
> Sending Error Reports
> Online Help support in Microsoft Office

But this can be recovered back...
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The Remedy
>Start >> Run
> Type gpedit.msc
>This opens the Policy Editor
> Now, Local Computer Policy >> Computer Configuration
>Then, Administrative Templates
>> Network > Now, click on QOS Packet Scheduler
>Now, on Right hand side
>Double Click Limit reservable bandwidth
> Now in Setting Tab
NOTE=>It says : Not Configured
Reality : The Explain Tab says "By default, the Packet Scheduler limits the system to 20 percent of the bandwidth of a connection" > So, on Setting Tab select Enabled
>Now, change Bandwidth limit (%) to 0 (Zero)
NOTE=>Misconcept : This don't means that you won't be able to communicate with Microsoft or any its services !
Actually : This reserved Bandwidth is only to accelerate Microsoft internet
connections more than other connections !
> Click OK.