Windows 7 can't connect to windows server 2003

I have HP core i5 laptop windows 7 pro 64bit sp1. since last three days I am not able to connect to my windows 2003 sbs sp2. I can ping or even can establish remote desktop connection. Earlier I was able to access shared files on the server. The rest of the machines (all windows xp pro) in the network are able to access the server. I have tried all the possible solutions. (flushing DNS, renewing IP etc.) My DHCP is handled by router and not by the server.

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Thomas GrassiConnect With a Mentor Systems AdministratorCommented:
IN AD list the computers does this computer show up?

Take a look at this
Did you try it with "net use"?

Thomas GrassiSystems AdministratorCommented:
Is this a domain?

Are you using a domain account?

Which version of Windows 7?
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hsdhawaleAuthor Commented:
This is domain but I am not using it. All computers are connected to server for file sharing.
I am using windows 7 professional sp1. Previously I was able to connect and use files on the server.
Thomas GrassiSystems AdministratorCommented:
So your using a local windows 7 account to logon the the computer with.

Then you need to add a local account to the server that matches the account on the windows 7 computer
Next give that local account file share permissions.

Would be a lot better if you logged on to the domain
hsdhawaleAuthor Commented:
I have already added local account on the server. While joining the domain it gives me error.

An attempt to resolve the DNS name of a DC in the domain being joined has
failed. Please verify this client is configured to reach a DNS server that
can resolve DNS names in the target domain
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