Location File/Folder to Delete
/Applications - Final Cut Pro
~/Library/Preferences - Final Cut Pro User Data
com.apple.FinalCutPro.plist
/Library/Application Support - Final Cut Pro System Support
Illustrator - drag the app to the trash.
Open user>library>application support<Adobe - in anything for Illustrator is in there, trash it
~/Library/Preferences - look for it's preference