Problem with administrative rights

I have been working on this computer for days and have tried many solutions.
I am on a personal computer with vista and am constantly getting the error
"the administrator has set policies to prevent this installation". I had to
disable the UAC to download the netflix movie player and to make a couple of
other changes. I don't want to go and disable it everytime I have to change
something. I installed Trend Micro Internet security pro about a month ago.
I don't know if that would have anything to do with it. If anyone can help it
will be greatly appreciated!