installing & registering 3rd and 4th instance | SQL Server Performance Forums

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installing & registering 3rd and 4th instance

I have created 2 instance of sqlserver in a server group in my win 2003 machine.Now when i installed 3rd instance of server from CD.When i tried to register this new server its shows that server doesnot exist.what to do?where i am wrong..pls suggest
best regards,
Here is the error im getting each time i want to register this new installed swlservr….
"SQL server doesnot exists or acess denied.[][connect]]"
Ensure you’ve defined proper server network protocol and registered with proper ALIAS. Refer to this KBA about potential causes on thsi issue. Satya SKJ
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