The video downloading is extremely slow after downloading Flash Player Active X (IE) and FP Plug-in

I have Windows 7 on a 64-bit operating system, and have Firefox 19 and Internet Explorer 8. I tried installing Flash Player 11.6.602.171 from the Adobe Website and got an error message right at 47% download "can not contact reliable source." I also tried uninstalling whatever Flash Player I had, but I continued to get the same error message at 47% "can not contact reliable source." Finally, following the advice found in the link below under "Program Bar Hangs During Download," I downloaded Flash Player ActiveX (internet explorer) and Flash Player Plug-In (all other browsers). It appeared that both downloads were successful and I verified that the installation was complete in the link below under "Verify that installation is complete." It says I have Flash Player 11.6.602.171. My issue now is that whenever I watch videos that use Flash Player, the downloading of videos is extremely slow.  For example, a 45 second youtube video might take 30 minutes to watch. I have tried everything (from General Info, Download Issues, Installation Issues, Post-Installation Issues) in this Adobe installation problem page http://helpx.adobe.com/flash-player/kb/installation-problems-flash-pla yer-windows.html but the problem has not improved. Can someone please help me? It would be greatly appreciated. Thanks!