Problems with Quicktime

[TheRaven2156]

Whenever I go to a webpage using quicktime (watching a movie trailer). I get a message error saying illegal plugin and then it shuts my webpage down. I currently have quicktime 7 installed and I tried deleted it to reinstall, but it wont even let me delete it. Im stumped any idea whats going on?

 

[LiLithTecH]

Was it installed under another account perhaps?

What version (7, 7.01, 7.02 etc...)?