No sound on 10.6.8 after installing MPEG2 plugin, Quicktime problem?

After installing the Apple MPEG2 component, which worked fine with MPEG Streamclip to convert MOD files to MP4, I opened iMovie and it said "Missing Quicktime Components, The QuickTime components necessary to view, edit, import, and export several kinds of movies are not installed. These components are included with the iMovie installer; please re-install."
I am wondering which components need to be reinstalled and is this the reason why I have absolutely no sound at all on the operating system and iTunes crashes if I try to open it
I have tried with another User - same problem
I have fully shut down and restarted the computer
I have reset the Audio Midi to 48000Hz
The internal speakers are selected and not greyed out
I have disconnected all external devices and the internet and the problem is the same

Thanks - this thread does address the MPEG problem but I still have no sound whatsoever on any program or the system. If I try to preview a music file in the finder with no other program open there is no sound as it won't play. iTunes just crashes when opening with this error:
Process:         iTunes [467]
Path:            /Applications/iTunes.app/Contents/MacOS/iTunes
Identifier:      com.apple.iTunes
Version:         11.0.2 (11.0.2)
Build Info:      iTunes-1102025001000000~1
Code Type:       X86 (Native)
Parent Process: launchd [104]
Date/Time:       2013-05-09 13:39:50.421 +0100
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version: 6
Interval Since Last Report:          1616875 sec
Crashes Since Last Report:           4
Per-App Interval Since Last Report: 3334226 sec
Per-App Crashes Since Last Report:   3
Anonymous UUID:                      141AE784-E67D-40A9-A793-F9DFEED553BA
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
- that's why I think it's a system problem.

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