You will need to download and run this:
Use the CC Cleaner Tool to solve installation problems | CC, CS3-CS6
which won't seem to do anything but you can't continue the process without doing it. Then you can go around and manually remove all the bits and pieces you can find. Don't only check the applications folder but also hard drive>library>application support>adobe and your username>library>preferences. Post back if you don't know how to get to those. Spotlight will not help you--it's programmed to ignore these kinds of files.
Then you can reinstall from scratch.