To configure IIS to run 32-bit applications you must follow these steps:
Open IIS
Go to current server – > Application Pools
Select the application pool your 32-bit application will run under
Click Advanced setting or Application Pool Default
Set Enable 32-bit Applications to True
If this option is not available to you, follow these next steps:
Go to %windir%\system32\inetsrv\
Execute the appcmd.exe tool: