Not enough information to check signature validity

Wed Feb 7 23:59:43 CET 2018

A friends had to re-install gpg4win as a result of a hard disk 
failure. Since then, all encrypted files received from her come with 
a warning "Not enough information to check signature validity." What 
can I or she, do to eliminate this message?

Sincerely,
    Marshall D. Abrams

This e-mail is a natural product. The slight variations in spelling 
and grammar enhance its individual character and beauty and in no way 
are considered flaws or defects.

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