Been there, done that.
Latest on the ZA forum is to not install KB951748 until they (ZA) come up
with a fix.
So far no fix is out.
Workaround is to move the Internet Zone Security from High to Medium.
It's a coin toss as to who you want to place your trust in at the moment -
MS or ZA.?

"MowGreen [MVP]" <mowgreen@nowandzen.com> wrote in message
news:%23IiWfPW4IHA.4492@TK2MSFTNGP04.phx.gbl...
> Have you tried rebuilding the winsock from a Command Prompt with ZA
> *completely* disabled and the native XP firewall enabled or, just
> disconnect from the net while doing the following ?
>
> Start > Run > type in
>
> cmd
> Click OK or press Enter
>
> At the Command Prompt, type in the below and press Enter after *each*
> command
>
> netsh winsock reset
> exit
>
> Restart the system and see if connectivity is restored.
> If no joy suggest you start a *free* support case with MS:
>
>> For home users, no-charge support is available by calling 1-866-PCSAFETY
>> in the United States and Canada or by contacting your local Microsoft
>> subsidiary. For more information about how to contact your local
>> Microsoft subsidiary for support issues with security updates, visit the
>> Microsoft International Support Web site:
>> http://support.microsoft.com/common/....aspx?rdpath=4 North
>> American customers can also obtain instant access to unlimited no-charge
>> e-mail support or to unlimited individual chat support by visiting the
>> following Microsoft Web site:
>> http://support.microsoft.com/oas/def...spx?&prid=7552
>
> Or, not. The decision is entirely yours. As is the decision to install
> Zone Alarm and continue using it when other free alternatives are
> available that are not toxic to the OS. Here's one:
>
> http://www.tallemu.com/free-firewall...-software.html
>
> MowGreen [MVP 2003-2008]
> ===============
> *-343-* FDNY
> Never Forgotten
> ===============
>
>
>
> noone wrote:
>
>> Might read the entire thread from ZA as it was tried by a few and got the
>> same results as me -no go.
>>
>>
>> "MowGreen [MVP]" <mowgreen@nowandzen.com> wrote in message
>> news:Oo7f8nV4IHA.2060@TK2MSFTNGP02.phx.gbl...
>>
>>>For those experiencing a loss of internet connectivity after installing
>>>KB951748 with Zone Alarm installed as the firewall, here's the fix by a
>>>Zone Alarm moderator:
>>>http://forum.zonelabs.org/zonelabs/b...ssage.id=52727
>>>
>>>
>>>>>If the windows update changed the usual needed files for
>>>>>networking/internet, then the ZA will not see
>>>>>the changes and continue to use the previously known files and ignore
>>>>>the newer files. Even though the
>>>>>file names and locations are still the same from before, now the file
>>>>>size and checksums no longer match.
>>>>>
>>>>>To solve this, just reset the ZA database and the ZA will be "fresh" as
>>>>>when it was first installed:
>>>>>
>>>>># Boot your computer into the Safe Mode
>>>>># Navigate to the c:\windows\internet logs folder
>>>>># Delete the backup.rdb, iamdb.rdb, *.ldb and the tvDebug files in the
>>>>>folder
>>>>># Clean the Recycle Bin
>>>>># Reboot into the normal mode
>>>>># ZA will be just like new with no previous settings or data
>>>>>
>>>>>
>>>>>Once this is finished, reboot back into the normal mode and in the new
>>>>>network found windows, set the
>>>>>new network to Trusted.
>>>>>Then do this to ensure the ZA is setup properly:
>>>>>
>>>>>Make sure your DNS and DHCP server IP's are in your Firewall's Trusted
>>>>>zone. Finding DNS and DCHP servers, etc
>>>>>
>>>>>1. Go to Run and type in command and hit 'ok', and in the command then
>>>>>type in ipconfig /all then press the enter key. In the returned data
>>>>>list will be a line DNS and DHCP Servers with the IP address
>>>>>(s) listed out to the side. Make sure there is a space between the
>>>>>ipconfig and the /all, and the font is the same (no capitals).
>>>>>2. In ZA on your machine on the Firewall, open the Zones tab, click Add
>>>>>and then select IP Address. Make sure the Zone is set to Trusted. Add
>>>>>the DNS IP(s) .
>>>>>3. Click OK and Apply. Then do the same for the DHCP server.
>>>>>4. The localhost (127.0.0.1) must be listed as Trusted.
>>>>>5. The Generic Host Process (svchost.exe) as seen in the Zone Alarm's
>>>>>Program's list must have server
>>>>>rights for the Trusted Zone.
>>>>>Plus it must have both Trusted and Internet Access.
>>>>>
>>>>>Oldsod.
>>>
>>>
>>>MowGreen [MVP 2003-2008]
>>>===============
>>> *-343-* FDNY
>>>Never Forgotten
>>>===============
>>
>>