192.168.1.1

You will need to reset the router to default settings. To do this there is a reset “pin hole” in 99% of all routers – since you were using 192.168.1.1 it could be a Linksys router, and their reset is located near the power plug in the back (use a cake tester, paper click, anything that will fit into that hole). While the unit is on, push for about 30 seconds, turn off and push another 30 seconds. Restart and the router will then be at factory defaults, then your ip address of 192.168.1.1 will work again.
You will have to reset the WEP and any other changes you made, just be careful not to change the ip address again, unless you write down what it was.
A good idea is to screen print each page as you set it up, so you know what it looked like before, then after. (screen print is done by the print screen button on your keyboard, then opening paint, or ms word, and pasting what you copied).