HELP! I'm trying to download the free Zimbra desktop application for mac osx. I'm currently on a Mac OS X version 10.5.6. Every time I try to install Zimbra as I am prompted to select if I "agree" or "disagree" with the users statement, a box pops up asking me "Please enter your password" and then at the bottom of the box it says "must be a member of the Administrators group" What is this?! I am the ONLY person who uses this computer, I'm the admin of my computer, so what password are they asking for? I tried leaving it blank and had no luck....HELP!