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This forum is for "Oracle Developer Tools for Visual Studio", which is an actual product for a plugin for VS.
You're probably looking for the OCI forum.. Oracle Call Interface (OCI) .
Apart from TNSPing, does SQLPLUS connect without issue? And there's only a single home on this box so we're sure it's not a multiple home issue? If you have multiple homes, you need to create tnsnames.ora for each.
What version of client are you using? There is a known issue with older versions of Oracle client where a 32 bit app on a 64 bit box would get a 12154 if the app location was in a path that contained parenthesis (c:\program files (x86)) for example. It's not a 32 bit problem per se, just that 32 bit apps usually install by default to (x86) location. If that's the issue you're running into, current versions of client don't have that problem, or just install the app to a path without parens.
Hope it helps,