Problem connectin SQL Server 2005

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On my machine I have installed :
Visual studio 2003 - .NET 1.1
Visual studio 2005 - .NET 2.0

All the application made by VS2003 don't work if I try use SQL 2005 (all
work fine using SQL 2000)

If I try make a connection from VS2003 to the SQL2005 server (using
VisualStudio Server Explorer) don't work (the error is unable to find server
or access deny)

>From Visual Studio 2005 all work fine

I use integrated security.

Someone have some idea?
Lorenzo


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