Hello,
In Windows Vista, even though your account is an administrator, programs you
open are only given 'normal user' access to your computer, unless they
request your permission or you explicitly give them permission.
New programs that are made to work with vista will be able to ask you for
permission automatically.
Older programs that do not know about Windows Vista, such as illustrator,
will need to explicitly be given this permission, since they do not know how
to ask you for it. To do this, right-click illustrator, and click Run As
Administrator.
--
- JB
Windows Vista Support Faq
http://www.jimmah.com/vista/