XP machines not acting the same

Alright, I have tried everything on the net to get my networked "worked"
out...
Anyway, Here is my problem:
I have a home network with 3 machines- 2 XP machines and 1 Win 7.
I swapped out an older XP machine with a new WIN 7 machine.
After changing everything under the sun(sometimes not waiting long
enough I think to let setting take effect) to get them all to
communicate.
PC#1) XPMike ETHERNET
2) WIN7 KIM WIRELESS
3) XPsunflower WIRELESS
99% of the time PC 1 and 2 see each other and share all folders.
MOST of the time PC #1 & 3 do also.
MOST of the time #2 and 3 do not. RIght now PC #2 can see and acces
shared folders on #3. #3 Doesn't see #2 at all or the shared folders.
I finally got frustrated and downloaded Network Magic to see if it
would help me get this sorted out to no avail.It follows along with the
same access that Windows shows with the machine
software(accessability-wise).
Oddly PC #1 & 2 see each other and share no matter what options I
change.I have tried Advance file share on the XP's also and still didn't
change anything(after disabling simple share) and re enabling simple
share.Right now Simple share is actually turned off the XP machines.
I have made exceptions in the firewalls on both.I tried the network set
up Wizard with a USB flash and countless other things that have not
worked.
I am finally now asking for help to get the home office buttoned up and
reduce issues in the future...
I also have attached some info below and can provide anything else
needed to get me through this.
Now, Please accept my thanks in advance!
WORKGROUP (“WORK” NO HOME GROUP)
Discovery etc is all on w\o passwords etc



3) “sunflower” (XP Pro SP3 Machine) Dell
192.168.1.102
255.255.255.0
MAC Address: xx:xx:xx:xx:xx:xx
Simple file sharing enabled
54Mbps
DYNEX G Desktop card #3 Packet scheduler miniport
WORKGROUP (WORK)
Discovery etc is all on w\o passwords etc
Firewalled w\ exceptions
#3 Scan info below also:

Internet Service
Default Outlook Express Mail POP3 / POP3 FAILED


Default Outlook Express News Not Configured
Internet Explorer Web Proxy Not Configured
Computer Information
Computer System
TOWER


Operating System
Microsoft Windows XP Professional


Version
5.1.2600


Modems and Network Adapters
Modems

Network Adapters
[00000000] Dynex G Desktop Card FAILED
Caption = [00000000] Dynex G Desktop Card
DatabasePath = %SystemRoot%\System32\drivers\etc
DefaultIPGateway = 192.168.1.1(Same Subnet) (PASSED)
Description = Dynex G Desktop Card #3 - Packet Scheduler Miniport
DHCPEnabled = TRUE
DHCPLeaseExpires = 9:32:06 AM 5/11/2010
DHCPLeaseObtained = 9:32:06 AM 5/10/2010
DHCPServer = 192.168.1.1 (PASSED)
DNSDomain = cmts.eph.ptd.net
DNSEnabledForWINSResolution = FALSE
DNSHostName = TOWER
DNSServerSearchOrder (FAILED)
216.144.187.199 (FAILED)
207.44.96.129 (FAILED)
216.144.187.71 (FAILED)
192.168.1.1 (PASSED)
DomainDNSRegistrationEnabled = FALSE
FullDNSRegistrationEnabled = TRUE
GatewayCostMetric = 25
Index = 0
IPAddress = 192.168.1.102 (PASSED)
IPConnectionMetric = 25
IPEnabled = TRUE
IPFilterSecurityEnabled = FALSE
IPSecPermitIPProtocols = 0
IPSecPermitTCPPorts = 0
IPSecPermitUDPPorts = 0
IPSubnet = 255.255.255.0
IPXAddress = 00000000:002275196678
IPXEnabled = TRUE
IPXFrameType = 255
IPXVirtualNetNumber = 2735D185
MACAddress = 00:22:75:19:66:78
ServiceName = BCM43XX
SettingID = {F244EC61-ECCE-4BD3-957D-D9C9432C6083}
TcpipNetbiosOptions = 0
WINSEnableLMHostsLookup = TRUE