To set a 64-bit mode IIS installation to 32-bit mode
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Open a command prompt and run the adsutil command. To do this, click Start, clickRun, and then type cmd.
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Type the following at the command prompt: cscript c:\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1.
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Close the command prompt.