Workgroup Network in small office

Hello.  I can't sleep because of this problem.... I keep banging my head...  Anyway I have gone over many logs about this.  Here is my issue I have 3 desktop wired computers. 1 running XP-Pro and two running XP-home. I have a netgear router thats connected to my DSL and then out to the wall plates (2) diff rooms. Then from wall plate it goes to a netgear switch at each location.  OFFICE#1 has the main pc running XPhome and  2nd PC running XPHome and network printer all connected to same switch. Office2 has the XPPro machine, phone modem these items are connected to the 2nd switch.  All are on the same workgroup (GHDOFFICE) and windows/Norton firewalls turned off. From office 2 XPPRO I can ping only the printer and the 2nd pc, in office1 but NOT the main pc. From office1 I can ping XPPRO machine and the printer from office 1, but NOT the main machine in office 1. Remote access has been turned on on all machines.  I have ran the network wizard on the XpPro machine only. Ran out of time had to leave the office.  Since the three machines have their own internet connection. Not sure what to select for the wizard maybe the "Other" option??  One last thing is that I can't see any of the machines under "view work groups" Error message "See the admin you do not have permission bla bla bla".  All three computers, the user have ADMIN access, but do not login with a password on 1 of the XPHome boxes.
Your help would be awesome!!!  Thanks for looking at my problem.  The main machine logs in with password and so does the XPPro machine.  Whats weird is I can ping all but the main machine.
THANK YOU