Can't see other puter on network anymore

[pj99]

I had a network setup with 2 puters with windows XP Pro SP2 and a wireless router and it was working fine, I had it set to obtain ip address automatically and everthing worked. I got uTorrent and it was stated that it would run better if ip addresses were set. I got the addresses for each one router xxx.xxx.x.1. And I set puter 1 xxx.xxx.x.2 wired and puter 2 xxx.xxx.x.3 wireless. Internet works on all and I can ping each of them and I can type the address in "run" and it will show the other one and let me access shared files. Under local network I can see puter 3 from 2 but not itself it says access denied when I try to acces puter 3. Puter 3 will see itself under local network but not puter 2. I have set simple file sharing on and off an it didn't make a difference. I can set them back to obtain ip automatically and it works again. I hope I have given enough info for someone to help me with this or lead to a website that would help solve this. This forum is great Thanks in advance