Networking problem, help please

Ok, so I went to my router using internet explorer, using the ip address, ect.

Its a linksys router, I reset stuff, ect. I see the one computer listed 3 times under 3 different Ip addresses, and I was just wondering why? when I turn that computer off, and reset the stuff on the router, its so much faster.

 

try
shutting down all computers
power off router

wait few minutes.
restart router

wait few more minutes
and power on the comps.

see how it goes.

 

please state in here do you use the dns or manual IP?
and what model number for your router?

 

ok, I am not sure, its automatic, so probably the dns.

The model number is: WRT54G