ORA-12154 error on Win7 64

Is there any solution for this error on Windows 7 64 bit (because I think it's the main cause) in .NET application? (ASP.MVC2 with EF4)

I've:

• Windows 7 64 bit
• Oracle Express 10g (i've tried to install Client 11g, but then, during installation i got another error - Net Configuration Assist~ Error - something about oraclj11 and java)

I've also checked and tried:

• tnsnames.ora - everything is all right
• tnsping - was successfull
• sqlnet.ora - NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

I'd like to connect with Oracle DB via ASP application (as above) and I still see this error. .NET cannot see alias which is in tnsnames.ora

Error: ORC-12154 and Oracle Provider not compatible with current OS (povider 32 bit, OS 64)

OS: Windows 7 64-bit, .NET 4.0, Visual Studio 2010, Tunel via SSH (putty)

Solution:

1. Uninstall oracle software, especially Oracle’s client (OracleExpress Client and whole db 10g)
2. Install Oracle 11g Client for Windows 7 64-bit. If occurs errors during installation (Config Net Assistant), check and clean previous Oracle’s software. Everything including register and ORACLE_HOME, TNS_ADMIN environment variables should be removed.
3. Install Oracles .NET tools for Visual Studio (it prevents 32 bit and 64 bit’s conflict)

4. Configure TNSNAMES.ORA and SQLNET.ORA

   • tnsnames.ora - check aliast with tnsping in cmd prompt (tnsping.exe exists in /bin
   • check environment variables: ORACLE_HOME, optional TNS_ADMIN: “ORACLE_HOME/NETWORK/ADMIN”

   • sqlnet.ora variables :

     NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
     SQLNET.AUTHENTICATION_SERVICES = (NTS)  
     NAMES.DEFAULT_DOMAIN = ORCA
     

For me atleast works fine.