[U2Lynne]

It looks like you want to go to your router and then the DHCP tab. And in that area you set a start range and and end range. Those numbers will represent the dynamic IPs you are giving out. I'd set something like 192.168.1.200 to 192.168.1.254. Now, you can give yourself a static IP that is NOT within that range, like 192.168.1.100. See if that works for you. When you make that change and save it, you may have to go to the other two computers, if they are on, and do a "ipconfig /release all", then "ipconfig /renew" in the terminal to get them a new local IP (or just restart the computers). If the IP they had been assigned before you change the router settings is not in the 192.168.1.200 to 192.168.1.254 range, then they would have problems.