Email Contents failed to show and the contents becomes and attachment

I am using Windows 7 Professional operating and Windows live mail version 15.4.3555.0308. Both my operating system and other microsoft products updates up-to date. So far I dont have any issues, but from past 3 weeks my live mail not working properly like it takes many times to load my messages and the email contents failed to show in preview pane.

I know this question has been asked before but am still have the same problem after I've tried all of the suggestions mentioned in this community. I dont use any other party antivirus program to scan my system except Microsoft security essential. 

Sometimes I could read my mails when I close it and re-opened. But now that trick also not working for me.

I dont like to go for thrid party mail like thunderbird etc. Hope someone can come with a right solution.

Thanks in advance