The UAC being "ON" is the "ONLY" reason you wouldn't install to the "program Files"
I purchased Windows 7 when it first came out just to get rid of Vista, from day one all my installs including my Vue installations and Photoshop CS3 and everything else has gone into the "program files" and works without any problems, none of the problems that Joelglaine speaks of for example. I regularly uncompress content and unzip new content into my runtime without a problem..

My UAC of course was switched "OFF" on day one also...

Injustice will be avenged.
Cofiwch Dryweryn.