The way permissions work hasn't changed in Vista.
Admins still have as much power as they had in XP.
What has changed is how much access PROGRAMS have to files and folders.
A program that doesn't prompt you for permission cannot use your
administrator power.
If you are having trouble accessing a file, you probably need to run the
program you are using "as administrator" by right-clicking it and clicking
Run As Administrator.
Changing file security settings on system files is not necessary and not
recommended.
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- JB
Microsoft MVP - Windows Shell/User
Windows Vista Support Faq
http://www.jimmah.com/vista/