Thanks for the replies Jock1e & sharpamat. Pressing the Reset button in the Internet options seems to have done the trick. Whilst it has cleared out the add-ons & bars, IE10 does appear to be working correctly. I can easily add back in the options I really want.
Incidentally sharpmat, fortunately I do have the correct version for my 64-bit Windows 7 SP1 system.
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