Not able to open websites like instagram and several others.

Hi,

I am not able to open websites like instagram, microsoft, and some more whereas, there is no problem with my connection because I am able to watch movies on youtube and access facebook with ease. I tried IE , Firefox , Opera and Chrome, same result:confused::confused::confused::nonono::frown::frown::frown:

I reset my modem/router,cleared cache,uninstalled and reinstalled my browsers but still no change:banghead:

Windows 7 - 32bit.

Please suggest what to do...

Andy