Problem usually experienced:
With a fresh install of SharePoint 2010, you cannot find InfoPath Forms Services under General Application Settings in Central Admin.
It’s also not visible under ‘Manage Service Applications’
Manually activate the feature using the stsadm command in management shell.
- Login to host with admin rights
- Open SharePoint 2010 Management Shell
- Run the following command
c:\program files\common files\Microsoft Shared\Web Server Extensions\14\bin\stsadm -o installfeature -name IPFSAdminWeb
Login to Central Administration and click on General Application Settings and you will see InfoPath Forms Services