Do you use DHCP to assign IP addresses on your network. Sounds like there may be conflict for an address. Your router should handle many connections - probably not the case that you have exceded the max...
I would try to reboot the network, starting from the wall out (first modem, then router, then PCs and printer). Failing that, I would look in the network menus on the devices and see how addresses are assigned.
On the PC, look in Control Panel, Network and Internet, Network Connection, Local Area Connection Properties, Internet Protocol Version 4 (TCP/IPv4) Properties and observe how IP addresses are obtained.
Thanks very much. Yes you were correct it was an IP address conflict. I found that when my wireless router was set up (by someon else) that they had a limited number of IP addresses listed in the router settings. I was able to add more IP address and then the laptop and the printer were able to both acquire their own IP addy's .