install error 1714!

i did have limewire but my dial-up connection was way toooooo slow so i thought i'd remove it but under add/remove programs the unistallation never worked so i had to do it manually! dodgy, i know but removed the file + set-up program + nil found when i run FIND for limewire.
so far so good, but now i'm on broadband + want limewire back + when i run the set-up now the installshield gives ERROR 1714 saying it's found an older version + i have to exit.
1- why doesn't limewire automatically override older versions on update?
2- how can i find + delete this older version?