I've been the bulk of the day hopping around threads on the web trying to find a solution to my problem.We are running a domain on Windows Server 2000. We recently purchased 3 computers that started out with Windows 7 Home Premium 64-bit, but bought the upgrade keys for Windows 7 Professional. However, I cannot get the computer to connect to the domain. Nor can it even ping the domain. It's as if the Windows 7 PC refuses to see the network. It does see the "unnamed network", but I can't find a way to recognize and connect to it.I have changed Local Security Settings, disabled the firewall, etc. I'm really at a loss...

Have you run nslookup to see what it says?1. Go to “Control Panel\Network and Internet\Network Connections”, in the NIC properties, ensure that File and Printer sharing is enabled. 2. Check if you can ping DC with its FQDN 3. Enable NetBIOS over TCP/IP in Windows 7: 1) Go to “Control Panel\Network and Internet\Network Connections”. 2) Right-Click on the connection and choose Properties. 3) Click “Internet Protocol (TCP/IP) Version 4” in the list. 4) Click Properties, and then click Advanced. 5) On the Advanced TCP/IP settings windows, go to “WINS” tab. 6) Under NetBIOS setting, click “Enable NetBIOS over TCP/IP”, and then click OK. 4. Start the TCP/IP NetBIOS Helper Service: 1) Log on to the client computer by using an account that has administrator 2) permissions 3) Click Start, click Run, type “services.msc” (without quotations) in the Open box, and then click OK. 4) In the list of services, double-click TCP/IP NetBIOS Helper Service. 5) In the Startup type list, click Automatic, and then click Apply. 6) Under Service status, click Start to start the TCP/IP NetBIOS Helper Service. 7) When the service is started, click OK, and then quit the Services snap-in. Please also try the following: 5. Boot to clean boot and see if you can join domain: How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7 If you have another Windows 7 client which is not in a domain, please check if you can join it to this domain.MCSE, MCSA, MCDST

Something else to consider as well.1. Enable NTLM 2 authentication on Windows 2000 computer How to enable NTLM 2 authentication LmCompatibilityLevel 2. Disable “Password Protected sharing” on Windows 7 computer: 1) Open Network and Sharing Center. 2) Click “Change Advanced sharing settings”. 3) Select “Turn off password protected sharing” under “Turn off password protected sharing”.MCSE, MCSA, MCDST

Also make sure that the Windows 2000 Server is updated to SP4.