Please install apple application support?

Quicktime and Application Support are separate components. Once you've lost one of the components you're better off to remove them all in the order specified in the link below, then download and reinstall a new lot. On Apple's website you can see how to uninstalling and reinstall all components on your PC.

http://support.apple.com/kb/HT1923

Source:

http://answers.yahoo.com/question/index?qid=20110520205810AArJnh9