1. Turn off router and computers.
2. Wait around 30secs.
3. Turn on router first. after you have stable lights on your router. turn on your computer(s).
4. go to start > run > type cmd.
5. on dos prompt (black box), type in "ipconfig" - without the quotes ""
6. look for ip address: make sure it starts with 192.168.x.x where x refers to any number

that's the basic solution... there are other solutions... but let me post it in another time... gotta go... please reply if this helped.