How do I delete an application for good?!

check if your quicktime is still in your Applications folder (Shift-Command-A). if it isn't, you can download the latest version of quicktime from Apple (find it on Apple's website)

 

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You can download appzapper and fully delete all files, even the ones you can't see within the applications folder. From there reinstall QuickTime.

 

Flip4Mac is a good app... allows you to play .wmv files on quicktime. It's in your Utilities folder.

 

This is a free app that will automatically delete the whole program, any program.

Appdelete

 

By the sound of it, you still have some files left over from the original app. hanging about somewhere on your HD! Try typing the app's name into Spotlight and delete any files that are revealed.

 

Still playing around with what will and will not work with Leopard, but back in Panther, I remember having good luck with deleting Flip4Mac and designating .wmv files to open with VLC. Can't remember what the particular issue was, but that resolved it.

Of course, you've probably tried getting file info (Cmnd + I) and designating the preferred app you wished to "Open with:", and then, just beneath that where you're offered the option to "Use this application to open all documents like this", selected "Change All…"

 

Though inexpensive, it's no longer free.

 

I think http://www.macupdate.com/info.php/id/25276/appcleaner is better.

 

Appzapper, Appdelete, Appclean, and similar, often fail to find all relevant files. (Believe me, I've done extensive testing!)

The best way is to use Spotlight, or, even better, EasyFind, which can search for invisible files and wildcards, too