Download Revo Uninstaller Freeware then use it to run the PRE4 uninstaller. Once that step completes Revo searches the registry and file system for leftover remnants. These are displayed and you choose which to delete. I generally let it delete all and have only ever had one problem where I had to rollback to the backup Revo automatically creates before each undelete.
Insanity is hereditary, you get it from your children