I was speaking with Chris online in IRC chat. here's a few more details:
WLM + msgplus were working fine without a skin, but got 2 different error codes after installing
http://www.msgplus.net/skins/view/158-Windows-Seven-Skin/
error codes were: 80071392 and 80048820. disabling plus by renaming msimg32.dll allowed normal operation and sign in of Messenger.
I tried the skin as well and its running fine but I'm not running .372 yet.
Also have WLM 14.0.8089.726 and Win7 ultimate 32 bit