Quicktime Application Crash

Question

Everytime I open an .m4v in Quicktime, it crashes (same in iTunes players, etc.). Are there any explanations or solutions for this? Here is what the error output gives me:
Problem signature:
Problem Event Name:BEX
Application Name:QuickTimePlayer.exe
Application Version:7.66.71.0
Application Timestamp:4ba1a755
Fault Module Name:QuickTimePlayer.dll
Fault Module Version:7.66.71.0
Fault Module Timestamp:4ba1a74a
Exception Offset:00005b6d
Exception Code:c0000409
Exception Data:00000000
OS Version:6.0.6001.2.1.0.768.3
Locale ID:1033
Additional Information 1:668b
Additional Information 2:2d2790fb9e4d62c050541d0586dcec57
Additional Information 3:6de9
Additional Information 4:60406521fb0030c3efc0698288adada4

Answer 1

No, they launch fine. It's only when I try to play or load a .m4v file that they crash.
When trying to play on iTunes, I get this feedback:
Problem signature:
Problem Event Name:APPCRASH
Application Name:iTunes.exe
Application Version:9.0.0.70
Application Timestamp:4aa72598
Fault Module Name:QuickTime.qts
Fault Module Version: 7.66.71.0
Fault Module Timestamp:4ba1b0eb
Exception Code:c0000005
Exception Offset:002ab53e
OS Version:6.0.6001.2.1.0.768.3
Locale ID:1033
Additional Information 1:fd00
Additional Information 2:ea6f5fe8924aaa756324d57f87834160
Additional Information 3:fd00
Additional Information 4:ea6f5fe8924aaa756324d57f87834160
Message was edited by: Fuinir