Help Could not perform this operation because the default mail client is not properly installed help vista
Users > John Smith > AppData > Local > Microsoft > Windows Live Mail folder
to a memory stick,
and reinstall version 2007 again or the latest version?
Then put all the stored emails back into Windows Live Mail folder
Get the Windows Live Mail 2007 version Here.
SOLVING THE PROBLEM
1. In Vista go to "Start Search".
Type "regedit" and click "Enter".
Regeditor will open.
Left click the arrow to the left of folder HKEY_LOCAL_MACHINE
Left click the arrow to the left of folder Software
Left click the arrow to the left of folder Classes
Right click the folder mailto
A window with a list of choices will appear.
Curser over "new".
Left click "String Value".
Double click "String Value".
In the window that appears type "URL Protocol".
Your problem is now solved.