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Editorial Team
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Asked: 2026-05-13T08:40:01+00:00

I recently installed SQL Server 2008 Express on my Windows 7 Ultimate x64 home

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I recently installed SQL Server 2008 Express on my Windows 7 Ultimate x64 home machine. I also have IIS 7.5 with PHP 5.3, and I was trying to connect to SQL via ADODB, but kept getting this error:

[Microsoft][ODBC Driver Manager] The specified DSN contains an
architecture mismatch between the Driver and Application

After doing a small amount of digging on the internet, I think this is because the SQL Server ODBC driver is meant for 32-bit operating systems, and mine’s 64. First of all, am I correct? Is this the reason I’m running into trouble? Secondly, if so, how do I fix this? Are there any updated ODBC drivers that work with 64-bit operating systems? I looked but was unable to find any…

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  1. Editorial Team

    You’re right in that it has to do with the bits.

    Hope this helps:

    –From MSDN —

    To manage a data source that connects to a 32-bit driver under 64-bit
    platform, use c:\windows\sysWOW64\odbcad32.exe. To manage a data
    source that connects to a 64-bit driver, use
    c:\windows\system32\odbcad32.exe. If you use the 64-bit odbcad32.exe
    to configure or remove a DSN that connects to a 32-bit driver you will
    receive this message.

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