Seems your problem is fairly well know in the Facebook community and it not related to Windows Live Mail or maybe even Windows 7.
It looks like the Facebook notification is trying to link back to something that is causing the crash. Some suggestions were an audio file that was supposed to play when you open the mail. One person suggested it was linked to a file that might be on your system named
aac_parser.ax. Which may be a hidden/system file, but since I do not seem to have it, I cannot tell.
For now, could you go to the Start Menu, All Programs, Default Programs. Select "Associate a file type or protocol...." and check to see what association is showing for the
.aac and
.ax file extensions. Do you have iTunes installed?
A temporary workaround might be to set your mail program to read all mail in plain text to keep any html code from running.
There may be a firewall or anti-virus issue that is blocking a component of the notifications causing the problem.
Why doing a mouse over the notification would cause a freeze, not really sure. But have you checked the Event Viewer to see if anything looks related. Make sure and check the time when it freezes so you can verify a message could be related.
The thread I got some of this info from is
here.
Edit: If you were to have the file mentioned, we might consider
later registering it to see if that helps. Perhaps someone else would have a recommendation, but
Link Removed due to 404 Error we could use later if you decide to try.