I Have seen a similar problem posted but the solution had no effect. My Windows Live Mail v 2012 started opening e mails with a single mouse click, very risky if the e mail is infected, when I go to highlight to delete it opens. I have 3 other windows 7 computers with WLM and they perform correctly. I have all my computers set up for one click file open but this just recently started on this computer, I have not been able to come up with a fix for the issue.

Windows 7 64 bit

WLM

Version 2012 (Build 16.4.3528.0331)
Copyright © 2012 Microsoft Corporation. All rights reserved.

Microsoft® Office 2010 Proofing Tools
© 2010 Microsoft Corporation.  All rights reserved.

gene