"Network path was not found" when joining domain

Dear All,
Good Day,
In Org, we have Domain Controller & Add. Domain Controller (Windows 2003 Server), And having around 50 workstation. The workstation OS Win XP, Windows 7 32bit and Windows 7 64 bit, boz of some issue i try to remove the workstation both Windows 7 (32 bit & 64 bit) from the domain and try to add then its giving me the below error:
"Network path was not found"
and i try the something with Win XP working there is no issue its adding to the domain correctly.
Could any one help me solve this issue ASAP, Waiting for your valuable Comments
Thanks
Kumar
Ram Kumar ChellamAsked:
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duffmeConnect With a Mentor Commented:
Unjoin as above, making sure to choose a workgroup name different than your domain name.
After unjoining you should reboot and logon with a local administrator account.
If you have internet access while unjoined go ahead and install any missing updates.
What is the version of the domain controller you are trying to join? (SBS, Windows 2003 domain, etc.)
Do you keep your computer accounts in the standard containers or have you created custom OUs?
Delete the computer account of the workstation you just unjoined.
Is your domain controller serving DNS, WINS, DHCP?
Verify that you have no orphaned or incorrect DNS or WINS entries for the workstation.  Delete them unless you are using intentional static management.
If using multiple domain controllers are the accounts, DNS entries, WINS entries, etc. syncing properly?  That is, do the entries, or lack of, match?

When unjoined, where do you see "domain.com (unauthenticated)"?
Go to Start Control Panel > Network and Sharing Center.  What shows as your active network?
Do you have any third party (eg, Symantec, NOD) firewalls installed or enabled?
Do you have customized Windows firewall rules?
Disable the Windows Firewall.

Please post your ipconfig.
Go to Start > Run > type cmd and then press ENTER.  On the command line type IPCONFIG /ALL, then press ENTER and cut and paste the output here in a reply.

While still signed in as a local administrator go to Start > Control Panel > System > under Computer, Domain, and Workgroup Settings you should see the name of the workgroup listed and not the name of the domain.
Click Change Settings, then the Change button and enter the name of your domain, preferably the fully qualified name mybiz.domain.com (or whatever it is) rather than the short name DOMAIN.  You will be prompted for the credentials of a Domain Admin and this will create a new computer account in the default container and join the domain.  Reboot.  

If this fails please post the IPCONFIG /ALL, tell us exactly where it fails and with what error.  Attach screen shots if you'd like.  Also please share any errors from the domain controller's or workstations Event logs during the timeframe of this activity above.

--Mike
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duffmeCommented:
Kumar, please clarify.  Are you saying you removed the Win7 machines from the domain and then join them to the domain again?  Can these machines ping the domain controller?
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Ram Kumar ChellamAuthor Commented:
Dear,

Thanks for your interest,

Yes i remove the Win7 Laptop(this error from only 2 laptops) from domain and try to add again its giving me the below error:
"Network path was not found"
yes these laptop can ping the domain controller, but the network connection show domain.com (unauthenticated).

Note: these both laptops having one more issue before i remove from the domain, when ever you restart the laptop and try to login while network cable connect its gives me the below error:
The Security database on the server does not have computer account for this workstation trust relationship

Waiting for your support

Thanks
Kumar
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duffmeCommented:
It sounds like you haven't properly unjoined the machines.  How did you unjoin these?  When you unjoin you should do two things: 1) join the workstation to a workgroup to unjoin it from the domain and 2) either delete the computer account or reset it.  You will not be able to rejoin using the same name if you don't.  When you rejoin you must be using a Domain Admin account. You may want to create the computer account in your preferred AD container first.

Are the workstations and server separated by a firewall, or have you changed the Windows firewalls?  If you have any scripts, mapped drives trying to automatically reconnect, etc. you will get errors on the workstations when they are not properly joined to the domain.  Resolve any issues pertaining to the local workstations (same goes for the server) other than the obvious issues mentioned above and then join again.
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Ram Kumar ChellamAuthor Commented:

Dear,

I did the same what you mentioned above for unjoin the domain, once i unjoing, i can't join the Domain because the network connection showing  domain.com (unauthenticated). after that i restore the laptop.

Waiting for your reply to solve this issue :

"yes these laptop can ping the domain controller, but the network connection show domain.com (unauthenticated)."

Thanks
Kumar
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