How to Enable NET Interop Support for Microsoft Office

1. Click the Windows 'Start' button and select 'Control Panel.' Click 'Programs' in the Control Panel. This shows all the applications installed on your computer. Click 'Microsoft Office' and click the 'Change' button.
2. Click 'Next' on the starting wizard window. Select 'Add or Remove Features.' Click 'Next.' Choose the 'Choose advanced customization of applications' option and click 'Next.' This displays a list of software options for your Office software.
3. Select 'Run from My Computer' next to '.NET Programmability Support' in each Office application you want to install. For instance, if you want to use Excel in your applications, choose this option in the 'Microsoft Excel' section. Click 'Next.'
4. Click 'Update.' The interop service is installed to your computer. Click 'Finish' on the final screen to close the installation wizard.