Cannot connect to Oracle DB in VS2008 Server Explorer, but can in VS2005?

I can connect to our Oracle server using VS2005 Server Explorer, but when I try the same operation, the exact same way in VS2008, I get the following error:
ORA-12154: TNS:could not resolve the connect identifier specified
My system is:
Windows XP SP2 (32bit)
VS2005 and VS2008
ODAC 11g 11.1.0.6.21 installed with all options
The Oracle Server is version 10.
Any help would be appreciated.

Thank you cshay for your reply, however I have already copied the TNSNAMES.ORA from the old installation I had of 9.2 to the new ORACLE_HOME/NETWORK/ADMIN/ folder. I had already seen the documentation which said I should do that - or rather deduced that I didn't have to retype it like it said and just copy the file over.
In any case, the VS2005 would be using the same ORACLE_HOME as VS2008 - I have already seen the documentation which states that all references would automatically point to the new installation.
I have also seen a case where the solution was to put add an Oracle.KEY file to the ORACLE_HOME folder - That file was already there and the key in the registry was there as well.
So no answer yet.

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I cannot make an ODBC connection from Exce-2007 to Oracle work. I am an expert Excel and VBA user (since 1994) and I have frequently used Excel to access ODBC databases, including Oracle (I have done this with Excel-2003 both with worksheet queries and have written VBA ADO-connection routines). And even though in Excel-2007 a worksheet ODBC query is supposed to be easier to create than in previous version of Excel, my connection fails. Any suggestions and all help are welcome and much appreciated.
DETAILS


1) What is my system? I am using Excel-2007 on Windows Vista x64 and Oracle server v.11g on my computer (all this is on my computer, no network issues).
2) Why use Excel with Oracle at all? I use Excel-2007 to access Oracle rather than Access-2007 (or any other application like TOAD, etc.) because I do engineering calculations with the data stored in Oracle. These calculations are easier done in Excel (I suppose that one alternative to this could be to use some sql or Access to get the data from the database, then store it as plain vanilla CSV file, then open this file in Excel, then do the math (the math involves complex optimisation algorithms), then save the results as CSV, then use some sql or Access to put the data back into the database. Howwever this does not strike me as a quick or neat solution. And after all Excel has been designed to access ODBC databases, so why not use it?)
3) What do I do in Excel-2007 that won't work? I create an ODBC link to Oracle that does not work. In Excel-2007 this is straightforward:

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<li>define an ODBC connection (Data tab --> From other sources --> From data connection wizard);</li>
<li>define a query on the worksheet -- that's it, this is all!</li>
</ul>

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The procedure for using an ODBC connection from Excel is very simple, in the past I have created and used such connections numerous times with Excel-2003 and earlier on Win-XP and earlier. But now on Excel-2007 and Vista-x64 I cannot make it work.
Also, testing an ODBC connection driver is really easy and simple to be done in the Control Panel. There testing the same ODBC connection, which fails in Excel-2007, results in success.
I am frustrated by the simplicity of the problem and yet the persistant error. I have lost now two full days in failed attempts to make the simple procedure work and in searching the internet for answers.
All help is highly appreciated <img class="emoticon" src="images/emoticons/happy.gif" border="0" alt="" width="16" height="16" />,
Plamen


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Excel 2007 is a 32-bit application.
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