Hi formidible,
Could you give some more information as to what exactly doesn't work?
Windows 7 by default has Windows Live Messenger 2011, while previous versions of Windows have Windows Live Messenger 2009, which has some significant differences.
You may want to try a complete re-install for start. Do note that Windows Live Messenger 2011 does not support "Personal Status." Skins and scripts will need to be compatible with "Live Messenger 2011."
Chat logs are saved as HTML or text, you can change this in the Messenger Plus! "Preferences and Options" menu.