Quicktime 10.4 does not open at all in yosemite

After clicking on Quicktime 10.4 icon in applications folder, it does never open. Icon appears not on the dock at all.
Please any idea on how can I solve this? how can I resintall it?
thx

After clicking on Quicktime 10.4 icon in applications folder, it does never open. Icon appears not on the dock at all.
Please any idea on how can I solve this? how can I resintall it?
Some aspects of you problem remain unclear. Are you saying that no "player window" opens, no "navigation window" opens, or the app itself does not open in the "Menu Bar" at all? Further, is the problem manifest itself globally or only in one user account? Nor is it clear if you are referring to the QT Player icon always being displayed in the dock or simply when/if the app is opened.
For instance, it is normal for a player window not to appear if no source media file was selected/opened via the finder. On the other hand, the failure of a navigation window or the app itself to open may indicate a system, app, or PLIST file (if still used) corruption problem. In the latter case, I would normally recommend switching to a secondary or guest user account to see if the problem is global or local to your primary account. If local, then you could either isolate/fix the local issue and fix it (e.g., locating and deleting an associated PLIST file if still used); create a new "primary" account, transfer required resources from the old to the new user account, and then delete the problem account; or simply re-install the entire system.
Unfortunately, under the latest version of Yosemite, the QT X Player is considered "essential" and the system, under normal circumstances, will not allow you to remove or delete the app any longer—probably because users in the past deleted the player on purpose or by accident on a wholesale basis and Apple does not provide downloads of the QT X Player independent of the operating systems with which they are associated forcing novice users to re-install their entire system or forcing more experienced users to re-extract the compatible player software for re-installation. Unfortunately, while it is still possible to re-extract the QT v10.4 Player from the installer package, the same system routines that prevent you from removing/deleting the player also prevent you from copying/replacing the current plater in the "Applications" folder.
Basically, what you should/can do depends on the specific nature of your problem and how well versed you are with the system.

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