To enable 32-bit applications to run in IIS 6.0 on the 64-bit version of Windows, you need to access your server via “Remote Desktop”.
Once connected to the server, open the Windows (CMD) console and navigate to the directory
%systemdrive%\Inetpub\AdminScripts
From this directory, run the following command to enable 32-bit applications to run:
cscript.exe adsutil.vbs set W3SVC/AppPools/Enable32BitAppOnWin64 1