Outlook - Can not send item

ISInce I have been on this computer running Win7 x64, I have been unable to send document directly from PDFCreator via email.

When I click on send, the documetn is saved, and an Outlook email wmessage window is opened. but if I enter an email address and click on send, I get a short error message "Item cannot be sent"

Outlook works weel in all other aspects.