Quote - A better solution is not to install those programs that have trouble with UAC into the "Program Files" tree.

In the last, and working, install I selected the'Program files (x86)' instead. I'm glad I did something right in the end.

Thanks silverblade for the link. Will keep it until I forget next time. If I can remember it then... :blushing:
at least I can find this thread when searching.