Many thanks Blackwar, looking at your solution, I thought "yep, that'll do the trick". I can see the logic behind your thinking and the message that comes up in the window "Please wait while Windows verifies that all protected files are intact and in their original versions" confirmed that this should indeed do the trick. BUT and there's always a but! But I'm sorry to say that this had had no effect at all, I'm still Task Managerless! (Oh and yes I did reboot before trying to see if it had fixed it).
Valiant effort, but I don't know what the B****y H***s going on, but it's really begining to P me off!
Many thanks anyway, and if you have any other suggestions please post, I am willing to try anything (well almost, as long as its physically possible and legal that is!!!!)

Greg.