WLDCore.dll missing; Windows Live Mail won't Start?

I apologize for the delay in response.
Please check if the wldcore.dll and wldlog.dll are available at c:\Program Files\Windows Live\Shared.
If they are available please copy them to the following locations.

• C:\Program Files\Windows Live\Messenger
• C:\Program Files\Windows Live\Contacts
• C:\Program Files\Windows Live\Mail 

or, there you custom installation location this program. exm: d:\windows Live\Messenger,contacts,mail or, e:\windows Live\Messenger,contacts,mail, etc as your installation location find it. 

Note: If you are using a 64 bit operating system, please use Program Files (x86) instead.
Hope this information was helpful. Please reply with the results and if you need further assistance or have any other queries regarding Windows, we are here to help you.