Months ago my entire list of contacts for Windows Live Mail was replaced by an old list from the 1990s (most of these had not been used in years and were never installed on this computer).  Also all my facebook friends were added to my contacts!  I know of NO REASON for this occurrence!  I have found no help with this problem anywhere.  It was suggested by someone with computer knowledge that installation of Windows 10 possibly would bring everything back to normal.  This didn't work!  I do love W10 however!  Can anyone help?

[Moderator Edit: Moved from the Windows 10 forums]