New computers cannot ping SBS 2008 or join the domain

Recently, I took over a site that someone else installed SBS 2008.  From looking at the server I can see why they are no longer there.  The server has about 15 uses and 9 workstations all ready in the domain.  Strange, they only have a 5 users lics.  I informed the owner to purchase move lics.  Alll the workstations that are on the server are working fine.  Presently, I am trying to add 3 more laptops to the domain.  All three can ping others, but  cannot ping or be added to the domain.  I took in my personal laptop can connected to the network and was not able to pring the server as well.  I even try turning off the firewall.

Thanks in advance
16JAMESHAsked:
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16JAMESHAuthor Commented:
The owner had installed the Symantec Security Suite.  Once, I turn off  security suite firewall, everything went great.  Thank you.
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16JAMESHAuthor Commented:
one of the errors was network path cannot be found
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JamesSenior Cloud Infrastructure EngineerCommented:
You need to verify that DNS is functioning properly. Are the client PCs and Laptops looking to the SBS Server for DNS resolution? On the client stations the DNS should be configured with the ip address of the Server. Check the ip schema on one of the PCs and also check DNS on the Server and check the scope options in DHCP to make sure that it is giving out the correct DNS addresses.
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JamesSenior Cloud Infrastructure EngineerCommented:
Open DNS Console from Administrative Tools and right click on the Server node name and click on Clear Cache. Open the command prompt and type ipconfig /flushdns and press enter and then type ipconfig /registerdns and then press enter.
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16JAMESHAuthor Commented:
I'd perfomed both suggections that you gave.  I even tried dcdiag /fix:DNS
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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