There is a note on Daz installers here
http://forum.daz3d.com/viewtopic.php?t=77881&sid=d45140af54ce0f8865de4cc411bf67a7

Did you go through and try some of the suggestions there?

Off the top of my head I would try right clicking the installer and running as administrator.

Shawn McCarthy
www.defyallchallenges.com