Having made the updated Windows Live Messenger 8.5 to version 2009 and having random bugs due to this shift I wanted to uninstall . But It appears that you can not uninstall it with adding and removing programs or Ccleaner, the program is non-existent in the list With spybot, Tools, News uninstall.
See the following:
Windows Live Messenger 14.0.8050.1202 ((059C042E-796A-4ACC-A81A-ECC2010BB78C))
version (major): 14
estimated size: 41459
install date: 20090111
install source: C: \ Program Files \ Common Files \ Windows Live \. cache \ 96549cf61c962e0 \
uninstall cmd: msiexec.exe / X (059C042E-796A-4ACC-A81A-ECC2010BB78C)
Publisher: Microsoft Corporation
Successfully uninstalled and reinstalled Windows Live Messenger 8.5 witout any problem. Thanks for you help!