I am new to this forum and would appreciate your help.
My goal is for sharing files and printer among all 3 computers through my
home network.  
I have 3 desktop computers at home [computer A  192.168.1.101 (Win XP,
Norton NIS 2006, Window Firewall disabled), computer B  192.168.1.102 (Win XP
pro, Norton NIS 2006, Window Firewall disabled), computer C  192.168.1.100
(Win XP, Norton antivirus 2006, Window Firewall enabled)].  All three are
connected (wired) to my Linksys router WRT54GS and are able to connect to
internet w/o problem.
Primary problem: computer A (192.168.1.101) and B(192.168.1.102)  were
unable to ping computer C (192.168.1.100).  A and B can ping each other.  C
can ping both A & B.  However, A & B can't ping C.  I have configured
computer C's both Window Firewall and Norton Antivirus to "trust" A & B and
even went as far as disabled (temporarily) both window firewall, Norton
antivirus on C and yet A & B can't ping C.  As a consequence (my assumption),
C can't print to B's USB connected HP printer and C can't access A & B shared
folders.  
Attached here is log of Ipconfig/all for C ("problem computer") as well as
ping from C to gateway 192.168.1.1 and 127.0.0.1 (loop)
Microsoft(R) Windows DOS
(C)Copyright Microsoft Corp 1990-2001.
C:\>ipconfig/all
Windows IP Configuration
       Host Name . . . . . . . . . . . . : computer c
       Primary Dns Suffix  . . . . . . . :
       Node Type . . . . . . . . . . . . : Unknown
       IP Routing Enabled. . . . . . . . : Yes
       WINS Proxy Enabled. . . . . . . . : No
       DNS Suffix Search List. . . . . . : socal.rr.com
Ethernet adapter Local Area Connection:
       Connection-specific DNS Suffix  . : socal.rr.com
       Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network
Connecti
on
       Physical Address. . . . . . . . . : 00-0C-F1-80-6D-CD
       Dhcp Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       IP Address. . . . . . . . . . . . : 192.168.1.100
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Default Gateway . . . . . . . . . : 192.168.1.1
       DHCP Server . . . . . . . . . . . : 192.168.1.1
       DNS Servers . . . . . . . . . . . : 66.75.164.90
                                           66.75.164.89
       Lease Obtained. . . . . . . . . . : Saturday, December 30, 2006
1:34:14
PM
       Lease Expires . . . . . . . . . . : Sunday, December 31, 2006
1:34:14 PM

C:\>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:

Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64
Reply from 192.168.1.1: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.1:
   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
   Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\>ping 127.0.0.1
Pinging 127.0.0.1 with 32 bytes of data:

Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
   Minimum = 0ms, Maximum = 0ms, Average = 0ms

Also attached is ping result from computer A to C including tracert log
Microsoft(R) Windows DOS
(C)Copyright Microsoft Corp 1990-2001.
F:\>ping 192.168.1.100
Pinging 192.168.1.100 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.1.100:
   Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

F:\>tracert 192.168.1.100
Tracing route to 192.168.1.100 over a maximum of 30 hops

 1     *        *        *     Request timed out.
 2     *        *        *     Request timed out.
 3     *        *        *     Request timed out.

I realize this is a very long message.  However, I hope with this
information somebody will be able to help me.
Much gratitude.