[Shirik]

You can't even run WoW as an administrator and hope to get it to run correctly (at this point) with addons. The reasoning behind this is complex, especially for someone without a coding background and an intimate knowledge of the internal workings of UAC from a programmer's perspective, but suffice it to say, Vista has "automagically" made a little copy of your Program Files folder with regards to WoW in a secret location (known as the VirtualStore). This copying is known as "Virtualization" and is the cause of your problems -- you aren't actually adding files to your program files directory as far as WoW's concerned -- it'll never even see those new addons. This occurs because Vista detects that WoW is a "legacy" application and tries to enter a compatibility mode for it, in which Vista actually "lies" (yes, this is the technical term Microsoft uses) about a lot of access rights, but tries to allow them anyway without compromising security of the system.

You're going to want to copy your WoW directory to something other than the Program Files folder. Personally, I just installed it on a completely different partition altogether. If you don't want to lose all your settings, you may consider going into your virtual store and pulling out your WTF directory, as well, but given that it seems you have zero addons installed, that shouldn't be an issue for you. But if you need it, it should be in

X:\Users\<user>\AppData\Local\VirtualStore\Program Files (x86)\World of Warcraft

Where X is your drive.

Hope that helps,
-- Shirik