Ok. I ‘took ownership’ of the Wintv folder but alas, no success.

Same as before, I get dialog which says: You do not have access to make the required system modifications. Please rerun this installation from an administrators account’.

Just to be clear, my account did have full privileges prior to problems.

I also tried hidden admin acc in safe mode but no joy there. Lastly, l created new acc (temp), which I granted full rights.

All three accounts show full rights, but do not actually have them!

scratches head :-\