Guys i was have the same problem BUT i fixed it
i used
Revo Uninstaller Pro
to uninstall the old versions of MSG PLUS and the Messenger LIVE
then i Installed both of them again
THEN
make a right click on the Messenger live icon or shortcut
choose:
Properties
Compatibility
and be sure that the Compatibility Mode is checked and choose
Windows XP (service Pack 3)
Apply , Ok
open messenger and congratulation