Windows 7 - Windows Live email -

Have had the problem for awhile and thought it would go away as these things sometimes do - now almost constant!

When I am typing my reply to an email, if I ever highlight and delete anything - all of a sudden, the greater part of the text in the entire message - both what I received and what I am typing will suddenly disappear.  Sometimes the undo arrows will restore - but all or part - never know.  Really hard to use and enjoy

my email when this problem is happening so often and I cannot get it fixed.

Happens on any given email message, not just those from certain people.  Problem is erratic, sometimes nothing bad happens, other times it will not stop

happening and I just shut the whole thing down.  May or may not work right when I return to try again. 

Several times recently, had occasion to uninstall/reinstall Windows Live - problem existed before and after. 

Need some guidance so this can be fixed.

Many thanks.