Adobe Photoshop CS6 won't install my CS6 trial.

My OS is Windows 7. I downloaded Adobe Downloader Assistant, downloaded CS6, and clicked on the 'setup' file, and it gave me an error mesagge saying that there was a prerelease/other version of CS6 interferring, and I had to uninstall it before I could install the package. I manually deleted said version, hoping that it would solve this problem, but no matter what I did, it kept giving me that message.

I even tried to use Adobe Creative Suite Cleaner Tool (And, for some odd reason, it kept asking me to insert a CD), but it still gives me the same message. What did I do wrong?