UAC  was introduced in Vista and in my personal opinion was not done very well.  With the introduction of Windows 7, Windows Server 2008 R2, Microsoft did a better job with UAC.   The jury is still out if it’s universal setting that stays enabled.    I wrote an article discussing how to configure IISLogs 2.0 with UAC enabled.

http://www.iislogs.com/articles/uac/

Enjoy,

Steve Schofield
Microsoft MVP – IIS