How to Enable IE 10 add-ons to create PDFs?

Question

I have IE 10 64 bit on Windows 8 64bit. I have Adobe Acrobat XI Pro.
In the Manage Add-ons area of IE 10 three add-ons for "Adobe Acrobat Create PDF" for the Helper, for Selection, and Toolbar. which are labelled as disabled. They are marked to 32 bit and 64bit architecture but when I right click on any of the three add-ons the Enable and Disable selections are grayed out. The more information selection reveals this.
Name:                   Adobe Acrobat Create PDF from Selection
Publisher:              Adobe Systems, Incorporated
Type:                   Browser Helper Object
Architecture:           32-bit and 64-bit
Version:                11.0.4.63
File date:              Thursday, September 5, 2013, 7:04 AM
Date last accessed:     Today, September 30, 2013, 29 minutes ago
Class ID:               {F4971EE7-DAA0-4053-9964-665D8EE6A077}
Use count:              0
Block count:            1394
File:                   AcroIEFavClient.dll
Folder:                 C:\Program Files (x86)\Common Files\Adobe\Acrobat\WCIEActiveX\x64
How do I enable these add-ons?

Answer 1

Thanks Bill,
Yes, the plug-ins are there in "Manage Add-Ons>Toolbars and Extensions."  But, when I select any of the three Add-ons for Adobe Acrobat, the view that follows has the "enabled" and "disabled" buttons grayed out. No matter how many times I select enable, the add-ons remain disabled.
I think the add-ons only work for 32 bit Internet Explorer, not the 64 bit Internet Explorer, or maybe not even for Windows 8 64 bit.
Ken