Ren111 OK here goes!
Comp1 (one with modem)
  Under properties for dial up connection (your ISP)
  Sharing    Enable ICS (internet connection sharing), on demand dialing
  Networking Enable TCP/IP leave Property settings default unless ISP req DNS setting. 
  Client for Microsoft Networks.
  Under properties LAN enable TCP/IP
  
  Set IP to 192.168.0.1
  Set subsetmask to 255.255.255.0
  Leave default gateway blank
Comp2 Under properties for LAN
      Enable Client for Microsoft Networks
      Enable File and Printer sharing for MS Networks
      Enable TCP/IP 
      
      Under TCP/IP Properties 
      General Tab set obtain IP auto and Obtain DNS auto
      Advanced tab set Default gateway to 192.168.0.1 don't change the other settings just leave them as default settings.
      Controle pannel Internet Options
        Connections  Local Area Network settings click LAN settings tab
        Check auto detect settings.
That should do it I am running a home network with 4 computers connected on the lan and all sharing the modem on my main Win2kP machine, 1  win2k, 1 win98, 1 win95. Also you may want to enable NetBEUI helps with finding comps on network.
 Hope this gets it working for you!
 
 Feel free to e-mail me with any other questions.
 Bigguy1