It usually tells me it failed to update until I completely close the performance tuner and re-open it, If that doesn't do it, try this:
I had to take ownership of the PTXML folder and change permissions. After doing that, I was allowed to change the folder's read only setting. Relaunched Autocad Architect and ran update, it worked.
that's alot of hurdles to clear!
No, the point is this needs to be fixed at the software design level, at Autodesk:
UAC is a reality that has been around since Vista. It's also a reality at most offices, an I.T. need.
Most AutoCAD users CANNOT run as administrators at work on work PCs. An I.T. need.
Pretending I.T. and office security needs can just be turned off to make AutoCAD work is just the worst solution offered by Autodesk, or any Autodesk employee offering support.
There needs to be a solution that just works with Windows 7, Windows Vista, and Windows log-in credentials realities that have existed for a very, very long time.
End of my rant
Yes, UAC can be a pain to deal with. However, I don't see it going away anytime soon.
Still, helping somebody by telling them they can resolve their problem if they adjust something, and that something needs IT permissions, may prompt said person to go to his IT dept. and ask for help to do this. This may not be possible for everybody, but it is definitely possible for some. That is usually part of IT's job... to help the users.