Hmm
that is strange. I have Vista x64 SP2, and my Live Messenger runs just
fine.
You issue may be due to Windows Corruption/Drive errors.

run a sfc /scannow check for Windows integrity violations, and do a
disk check.
note- to run the system file integrity check , see step one, but copy
and paste
this instead of defrag c: -w

*sfc /scannow*
http://www.vistax64.com/tutorials/16...er.html?filter


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rive0108