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On windows 7. I've googled this, and can find nothing on-topic that doesn't reference Sony Vaio or Soundblaster, neither of which I have.Quote:
msnmsgr.exe - Application Error
The application failed to initialize properly (0xc0000005). Click OK to terminate the application.
Any other changes recently? Also what AV are you running?
Might try starting in safe mode, see how that does.
Security Update for Windows 7 Beta (KB958690)
Installation date: 3/11/2009 8:37 PM
Update for Microsoft Office Outlook 2007 Junk Email Filter (KB962871)
Installation date: 3/11/2009 8:37 PM
avast!
Can you roll it back to the last time it worked?
Reinstall messenger