Check these Registry setting against yours on the XP Pro System. If they are different right click on FirewallPolicy and select Export. Save it as preFWfix.reg.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List]
"%windir%\\system32\\sessmgr.exe"="%windir%\\system32\\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019"
"%windir%\\Network Diagnostic\\xpnetdiag.exe"="%windir%\\Network Diagnostic\\xpnetdiag.exe:*:Enabled:@xpsp3res.dll,-20000"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\GloballyOpenPorts]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\GloballyOpenPorts\List]
"3389:TCP"="3389:TCP:*:Enabled:@xpsp2res.dll,-22009"
"139:TCP"="139:TCP:*:Enabled:@xpsp2res.dll,-22004"
"445:TCP"="445:TCP:*:Enabled:@xpsp2res.dll,-22005"
"137:UDP"="137:UDP:*:Enabled:@xpsp2res.dll,-22001"
"138:UDP"="138:UDP:*:Enabled:@xpsp2res.dll,-22002"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"EnableFirewall"=dword:00000001
"DoNotAllowExceptions"=dword:00000000
"DisableNotifications"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List]
"%windir%\\system32\\sessmgr.exe"="%windir%\\system32\\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019"
"%windir%\\Network Diagnostic\\xpnetdiag.exe"="%windir%\\Network Diagnostic\\xpnetdiag.exe:*:Enabled:@xpsp3res.dll,-20000"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List]
"3389:TCP"="3389:TCP:*:Enabled:@xpsp2res.dll,-22009"
"139:TCP"="139:TCP:LocalSubNet:Enabled:@xpsp2res.dll,-22004"
"445:TCP"="445:TCP:LocalSubNet:Enabled:@xpsp2res.dll,-22005"
"137:UDP"="137:UDP:LocalSubNet:Enabled:@xpsp2res.dll,-22001"
"138:UDP"="138:UDP:LocalSubNet:Enabled:@xpsp2res.dll,-22002"
Copy the text below to NotePad and save it as Firewall.inf then right click on it and select Install. Log off and then log back on for it to take effect. Keep us posted.
[version]
Signature = "$Windows NT$"
DriverVer =07/01/2001,5.1.2600.2132
[DefaultInstall]
AddReg=ICF.AddReg.DomainProfile
AddReg=ICF.AddReg.StandardProfile
[ICF.AddReg.DomainProfile]
HKLM,"SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List","%windir%\system32\sessmgr.exe",0x00000000,"%windir%\system32\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019"
[ICF.AddReg.StandardProfile]
HKLM,"SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List","%windir%\system32\sessmgr.exe",0x00000000,"%windir%\system32\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019"