Help! I deleted Quicktime X from the Application Folder!

If you've been using TIme Machine to back up your system, you should be able to just restore QuickTime Player X from the backup. Otherwise, you'll either need to copy QuickTime Player X from another computer running the same version of OS X, reinstall OS X, or extract QuickTime Player X from the Mac OS X install disk using CharlesSoft's Pacifist.

If, however, you deleted other files pertaining to QuickTime other than just the Player application, reinstalling OS X will probably be your only route to recovery.

Once restored, if you then need to install QuickTime Player 7, see:

http://support.apple.com/kb/HT3678

Regards.

How would one do this if the system software was a downloaded online from Apple and I do not have an install disk?

Using Pacifist, the current version of which can extract the files from the Recovery Partition/Internet Recovery facility provided by Lion. Or by reinstalling Lion.

Regards.