I had the same problem guys.
I tried to find the solution on google.
I tried everything I found on may forums except resetting router.
But no luck.
Then I replaced my router to see
whether I can open 192.168.1.1
And yes. I was able to open that page.
Again I replaced my router which I was using.
It didnt work with that.
I thought it must be the incoming line causing the problem.
I disconnected my incoming line (Telephone Line) from my ISP (BSNL)
and tried to open 192.168.1.1.
and it worked.
Try this, it may work for you also.