O.K. Guru's I'm stumped on this one. I am trying to configure a simple file sharing network between 2 Windows XP Pro computers for a friend of mine (something I've actually done a couple of times already). I have swapped everything out of the entire set-up except the computers themselves and I can't figure this out. I will attempt to describe what's happening as best as possible. Computer R = IP = x.x.x.100 Computer O = IP = x.x.x.101 Test Laptop(LT) = x.x.x.102 Router is Linksys BEFW11S4 (however I put this router on my home network and it functioned perfectly so I do not think it is the culprit) there is NO WAN / Internet connection on this network (future use) and the wireless is disabled (future use) All cables are Belkin off the rack (not home made) and have been swapped around and are assumed good. Here goes: All computers that connect to the router are using DHCP and all are assigned an IP address. Note - all pinging was done by IP address. Name resolution on this network fails - however when used on my home network - names resolved fine. From Computer O I can ping Computer R and LT but can NOT ping itself From LT I can ping Computer R and itself but NOT Computer O From Computer R I can ping LT & Itself but NOT Computer O (I know it gets screwier - I had to draw myself a picture just to get this far ;g ) Computer O & R are "off the shelf" Dell systems running identical hardware & software (including Norton AV) and both network cards are configured alike. The only difference I can find is computer O is also configured with a dial-up internet connection with Windows firewall enabled. I tried disabling the firewall to see if that was affecting things but it did not help. I also tried to remove & re-detect the network card in hopes of killing any hidden setting that may have been skewed. This is for my friends small business and she really can't afford to call in the "big boys" to come set this up for her but I'm beyond the scope of my intelligence - any help you folks can offer would be greatly appreciated. Also - speed is of the essence - computer O is supposed to play the role of "server" to her Point of Sale software and until this network issue is resolved she cannot start entering her inventory and that is on the verge of delaying the opening date for her store. Thank you in advance for any assistance you can provide.