At first I noticed a slow down with my ISP (Verizon FIOS) from 15mb/s to 6-7mb/s, but the upload speed is unaffected. So, I called my ISP they told me could be an issue with the Windows that I am using.
Then I called MS regarding the network issue, however they told me that my license has expired is not under warranty for technical support. Here I am asking for some help.
Some of the thing that the ISP done was conducting some test:
Buffer size:261360 bytes
Receive size: 66608 bytes
Their ISP network technician told me that the Receive size was too low and causing problem to the download speed, but the upload speed is still good.
So, anyone who have any suggestions will be greatly appreciated.