I downloaded it about 3-4 times already, and even tried 10.4 When you right click on your desktop, it usually shows ATI Catalyst, and when I click to open it it doesn't open. OS = windows 7 hardware = ATI radeon hd 5870, i5-750, 4gb dual channel ram, 500 gb 7200rpm HDD, 22x dual layer dvd/cd rom.
dude i had the EXACT same problem as you do (but with 10.4). I even have the alienware aurora---brand new! haha
so to solve this, then i went to the control panel, uninstall a program, then i uninstalled/removed the catalyst install manager. then i installed the 10.4 CCC, restarted and presto! actually, you may have to restart after removing the install manager but i can't remember.
i looked high and low to solve that and found that people have been bumping into this problem since like CCC 9.x and that's how they got through the problem!