Thank you for your reply spunk.funk & sorry for the delay in replying, trouble with TSF logging me out in this post, but it's fine tonight.
No my add-ons are not disabled. Usually when I start IE9 the message appears at the bottom of the screen saying: would you like to speed up IE9 by disabling add-ons? I have not had this message appear in ages, so I clicked on it and there were my add-ons and they are enabled. I have provided a screenshot for you to see.
Unfortunately the same problem is still there, you cannot see my add-ons if I select Tools and then manage add-ons or if I select Settings and access them from that menu.
My add-ons are enabled and there, they are just hidden, as I had expected.
I think a re-set may not solve this one? There must be a setting amiss I think.