QuickTime new install hangs, freezes executing MOV files?

Question

Once worked?
A iTunes user I have removed & reinstalled ITunes back having same issue never fixed awhile (I did not know it was I QuickTime thing)
I tried to run any video in iTunes or podcast and it freezed.. I lost mouse keybd everything Reboot!
That was iTunes on another ticket suggested that I remove & reinstalled... same problem, never did solve it?
Today I tried QT, running a MOV from fresh boot, to execute a MOV file, one that worked and I created a year ago..
I went repair soft and apps in control panel, then finally remove & reloaded it, Quicktime still freezes when executing a MOV file.

Answer 1

1] Try it with another user account (make one if you need to in Apple menu > System Preferences > Accounts)
2] If its only happening in your account:
Inside your hard drive, in the Users folder should be your user home folder (with your account name.) Within that folder is a folder called Library... open that and look for a QuickTime folder within, pull that QuickTime folder out to the Desktop. Do the same for Internet Plug-ins and throw away the ~/Library/Caches/QuickTime folder too. Then, open Preferences and pull out com.apple.quicktime... (all of them) and the QuickTime Preferences file.
Then log out (Apple menu) and back in (or restart) and try again.
3] If its happening for all users then try:
Pull the /Library/Preferences/com.apple.quicktime.plist to the desktop (Your QuickTime Pro registration is in that file so don't throw it away, just move it out, restart and try again.)
4] If there are still problems, try repairing your disk either with the OS X install disc (run Disk Utility from the menu bar) or by rebooting in Singel-User-Mode and running fsck. Then repair permissions with Disk Utility.
Let us know if you still have trouble.