Have a look through this sticky post:
http://www.wowinterface.com/forums/s...ad.php?t=14762
Also, better than turning off UAC, just move (cut/paste) your WoW directory to somewhere other than Program Files (like C:\Games\WoW)
edit: and it's usually only necessary to post your question once around here
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh