In this article I will explain with an example, how to enable 32 bit Applications in Application Pool of IIS Server versions IIS 7 and IIS 8.
In 64 Bit windows server operating systems, by default 64 Bit .Net Framework installed and hence when you try to deploy a 32 Bit application (website) on IIS Server it results in an error.
 
Enable 32 bit Applications in Application Pool of IIS Server
Following are the three simple steps to enable 32 bit Applications in Application Pool of IIS Server.
1. Open Internet Information Services (IIS) Manager and click on Applications Pool from the Left window as shown below.
IIS 7 and IIS 8: Enable 32 bit Applications in Application Pool of IIS Server
 
2. Now Right click on the Application Pool for which you want to enable 32 Bit applications and click on Advanced Settings option from the context menu.
IIS 7 and IIS 8: Enable 32 bit Applications in Application Pool of IIS Server
 
3. In the Advanced Settings window, look for Enable 32-Bit Applications property, set it to True and click the OK button.
IIS 7 and IIS 8: Enable 32 bit Applications in Application Pool of IIS Server