[pm-r]

Try this:
Rebuild the Spotlight Index | OSXDaily

or this:
https://www.google.ca/search?client...&oe=UTF-8&gfe_rd=cr&ei=BfOVVKTtHoqo-QOVmoGYDA

 

[pm-r]

I haven't got a clue or what you mean about some of your comments like; "lot of ads covering the image of the Privacy window move" and "virtual external hard drive".

You shouldn't have any ads or anything other that the Finder and the Pref Pane windows showing.

And are the "drives" real mounted drive volumes or some sort of "virtual Image" disks???

 

[pm-r]

I guess you've got some real problems if you can't even read the directions on web pages due to ads.

May be try some other searches and see if you can read the hits like try:
https://www.google.ca/search?client...&oe=UTF-8&gfe_rd=cr&ei=KjaWVNP3Ne6h-APRloDIBA
or
https://www.google.ca/search?client...&oe=UTF-8&gfe_rd=cr&ei=5TaWVPX5C9TQ-APRo4GAAw

But it sounds like a permission problem with the mounted volumes as Apple says:
"Note: You can only add folders or items to the Privacy tab that you have ownership permissions for. "

Or try using the + method to add a drive or volume and follow the instructions to navigate and select the drive. Doing so may give a message as to why you may not be allowed to do so.

You can check them by selecting each and do a Get Info on them and check the permission settings. Or even try selecting the option in that window to "Ignore ownership on this volume". That may help.

Maybe some other members will chime in with some other suggestions for you to try.

Add:
But you should be able to read this:
Spotlight: How to re-index folders or volumes - Apple Support