One other possibility would be to right-click, then select delete to send it to recycle bin (don't empty recycle bin yet) and wait a few days to see if everything is still working OK. If all is OK, then you could go ahead and empty recycle bin. If not OK, you can restore it from the recycle bin. At least this way you can recover it if you need it.
Or, you could just go to Control Panel > Add/Remove and uninstall Quick Time completely (then get rid of any lingering folders it doesn't delete). Then, if you do want Quick Time, redownload it fresh from the QT web site. At least then you will have it taking minimal space. Of course, that means losing any movies you may have stored (do you have a burner so you could save things to a CD/DVD first?). My other thought is this: Since it is a laptop and not a full-size computer, do you really WANT movies on it? Do you even really need QT? If not, just get rid of it....depending on what you plan to do with the laptop.
Best....Larry