I am getting this message when I try to start Windows Live Mail in one account on a Windows 7 Home Premium machine, and the program refuses to start.  The problem appeared out of the blue yesterday.  I can start the program OK from my own (administrator) account, and from a new Test account I have set up, but not from the account for the main user of this machine.

Have done a search on the web, but not found any solution there.  Can anyone help, please?