Windows Live Mail not opening

Hello,

I use Windows Live mail and it can't be started any more. A note says that it might not be installed correctly. Can't be as I have been using it for a year now. Note says also that my disk might be full and out of memory which is not the case.
What can I do to be able to open my Windows live mail all my mails for work are in it. I urgently need to have access to those mail

Thanks
Percy