MSN & CABOS quits on launch...HELP!

Help!

I got up this morning and MSN gave me this message:

'Application MSN Messenger has unexpectedly quit.

Mac OS X and other applications are not affected.'

CABOS gives me the same message too. They worked fine 6 hours before. I had left safari on over night downloading a film. No joy after restart. No joy after delete (in p.lists) and reinstall. No joy with older versions. Help! I spend 18 hours a day drawing at my desk and need communication with the outside world!

These are from the crash logs:

-------------------------

Host Name: alex-kirkwoods-powerbook-g4-12
Date/Time: 2008-01-20 17:59:34.987 +0000
OS Version: 10.4.10 (Build 8R218)
Report Version: 4

Command: Microsoft Messenger
Path: /Volumes/Microsoft Messenger/Microsoft Messenger.app/Contents/MacOS/Microsoft Messenger
Parent: WindowServer [93]

Version: 6.0.3 (6.0.3)

PID: 403
Thread: Unknown

Link (dyld) error:

Symbol not found: _QTSecurityPolicyCanUseDataRef
Referenced from: /System/Library/QuickTime/QuickTimeComponents.component/Contents/MacOS/QuickTimeComponents
Expected in: /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime

------------------------------


Host Name: alex-kirkwoods-powerbook-g4-12
Date/Time: 2008-01-20 17:57:02.874 +0000
OS Version: 10.4.10 (Build 8R218)
Report Version: 4

Command: Cabos
Path: /Volumes/Cabos MacOSX/Cabos.app/Contents/MacOS/Cabos
Parent: WindowServer [93]

Version: ??? ()

PID: 366
Thread: Unknown

Link (dyld) error:

Symbol not found: _WarholFSResolveAlias
Referenced from: /System/Library/QuickTime/QuickTimeComponents.component/Contents/MacOS/QuickTimeComponents
Expected in: /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime