How to Solve the 'microsoft.ace.oledb.12.0' provider is not registered on the local machine for iis site

1. Open IIS Manager
2. Select "Application Pools" under your server in the "Connections" panel on the left.
3. Select your application's application pool from the "Application Pools" panel in the middle.
4. Right Click on your Application Pool and select "Advanced Settings…"
5. Set the "Enable 32-Bit Applications" setting to True

Source Link : http://blogs.netconnex.com/2009/08/configuring-iis-on-64bit-windows-7-to.html