Audition. Installation Problem :(

I open up Adobe Audition 3.0's setup then after it "installs", a message pops out:

"A problem occurred when extracting some files. Check available space on your computer and the write privileges on the destination folder."

It can't be my space because I still have 50GB left in my computer. I even tried to run the setup as administrator but it still doesn't work. I have the recommended specifications for Adobe Audition too but it still won't install

Are you the administrator on your computer and what kind of Operating System (eg. Windows Vista, 7, 2008, etc.) are you on?

Yes I am the admin of the computer. I use Windows 7