hi
i have another question:
i conecct to internet throght LAN and share my internet for my workgroup computer, after installing longhorn 4051 my internet connection doesn't work, also i cant share it for another computer in my workgroup. when i start network connection wizrd it say to your account type does not permission u to setup for small office.
what must i do? and why i cant share my internet or setup for small office?
thanks.
i have this problem in longhorn.

sounds strange that you cant connect to the internet...

OK. What kind of internet connection do you have (Dialup, Cable, DSL etc.)? Is the PC running longhorn directly connected to your internet connection? What OS is your other computer running?

thanks for reply
i am not an amator. my workgroup network doesn't has a problem in xp, it has a problem in longhorn. internet sharin disable in longhorn. however my internet connection in LAN whit 100mbps speed.
i note that again my internet sharing has not a prblem whit xp. excuse me, my english is not good.
thanks.

nazanin302 check this out it might help you, it's not mine I got it from another site.

Repair Longhorns Networking

In terms of Networking, build 4051 is sort of.. well.. messed up. You may not be able to browse some computers' network shares or even the entire network itself. To fix this, follow the instructions below.

Make sure that your workgroup is set the same as all of your other machines. You can change this by clicking the Windows flag (Start), right-clicking on My Computer, and selecting Properties. Click the Computer Name tab, and then click the Change button. Change the workgroup name and press OK. Don't reboot if asked.
Next, you will need to change a setting for the Client for Microsoft Networks. To change this setting, click the Windows flag (Start), and then click Control Panel. Double-click Network Connections. Next, right-click on "Local Area Connection" and click Properties. Select "Client for Microsoft Networks" and then click "Properties". Click the arrow next to the first drop-down box in the Properties dialog and select "Windows Locator". Press OK, and close the Properties window.
Restart your computer.
After performing the above steps you should be able to browse through network shares and other network related items without any problems.

Networking Fix For Longhorn – Static IP and Wan Connection

Error:
Altering your networking properties (ie, IP address, gateway), causes the updated (and broken) TCP/IP stack to be activated. Unfortunately, the updated stack cannot seem to differentiate between a WAN IP, and a LAN IP, and therefore accessing pages beyond its own subnet is impossible. (Browsing local addresses is fine - it's when you try to access the internet itself that things go pear-shaped).
Apparent Cause : Using the IPV6 Tunneling when you switch from DHCP to Static and/or back it gives you more than 1 IP address thus hosing up the tunnel system its using to utilize this connection.

Fix:

Disable the connection.Right click the network connection.
Uncheck Microsoft TCP/IP Version 6 (This way connection doesn’t use it. You are unable to uninstall it in this version).
Setup your Static IP Information.
Re-enable the connection and you should now be on the internet with an active connection and no need to start all over again
Cannot Complete the Network Setup Wizard, Longhorn 4051
(Thanks to Samael on xBetas for figuring this out)

Error:
To set up a network you must have permission to configure Internet Connection Sharing, Internet Connection Firewall, and network bridging.

FIX:
Control panel ? Click on user accounts ? Click on "start the network identification wizard”

Nicve one Gibbo

This site rules!!!!!!!!!!!!!!!!

thanks dear gibbo.