local area connection changed

On one of my XP systems I now have local area connection 4 while the other
has connection 3 and I can not connect each computer like I could before. I
think this might have happened when I installed Linksys wireless printer
server but I am not sure. Can anyone please tell me how to change setting
back as before? I am showing network connection details on the system that
can not connect any longer to other system and laptop as DNS Server
192.168.15.1 while the other system shows DNS Servers(2) 68.87.71.226 and
68.87.73.242. Both have the same SNM but default gateway is 192.168.15.1 and
DHP 192.168.15.1

I am confused and have not seen anyway I can make them what they should be.
Should I try to delete something and run the wizard again?

Anyone with any suggestion would be helpful.
Thanks.