That should be setting dependent. If it's a library computer, they probably don't want you doing what you're trying to do. I don't have any problems like that using Vista at home since I don't have it configured that way.
I've only been using Vista for about two months, since I bought a new box, but I love it. It's much faster and stabler than XP ever was, but you need the right hardware for it.
It's all moot anyway as I should be getting my (free) W7 upgrade any day now.
My sentiments exactly. On your home machine, you should automatically be set as an administrator. If you're not for the odd program, right click & select "Run as administrator"
As for 7, I'm hearing "great things", but...I duuno, I've got no beefs with Vista Ultimate & hardware/software (mostly) designed for it. I think I'll leave well enough alone, especially 7.0. I don't like anything .0!