Hi . excuse me my english not good .
first ur pc ip set to 192.168.1.2 and disable all Firewall .

First thing you need to do now is Reset the Router and then go back and read my post! (peerData)

If your DHCP is leasing address' from 1.2 to 1.1 its going to fail. Thats like asking a computer to divide by 0.
If you managed to set your DHCP then you should be able access the router in the same manor.
Set your DHCP to lease from 1.2 to 1.254 (unless you have reserved IPs within that range)

If thats not happy check IPCONFIG, you gateway address should be the one that your router is on

Yes your Gateway by default should be 255.255.255.0 Unless you configured this different then you wont have to worry about this. But it brings for a good thing to look in to. Make sure that your IP on your computer wasn't set to Static and somehow you ended up changing or using a different Gateway, such as 255.255.255.254 or 255.255.0.0 ... Make sure it matches the router... Again I would allow DHCP to handle all that, unless you have a Server in which case all you need to worry with is setting a static IP.

I also found out that you are not allowed to access and configure a Router/Modem settings via a Wireless Connection. So you have to be connected directly to the Router/Modem. (in most cases)

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.

Raj