Weird Error Message

[1wing-angel]

I have a computer setup with GnuPG and everything so far is working ok. I
recently sent a "Signed email"(not encrypted) to one of my friends at
hotmail. She responded back, her message came through ok but then there was
an error. The below is the following error. 
 
OpenPGP Security Info 
 
Error - signature verification failed 
 
gpg command line and output: 
G:\\Program Files\\GNU\\GnuPG\\gpg.exe --charset utf8 --batch --no-tty
--status-fd 2 -d 
gpg: Signature made 08/15/06 01:19:02 using DSA key ID FJEIFLSA 
gpg: BAD signature from "My_name <my_email at gmail.com>"; 
 
^ What does the above mean? Should I be alarmed? 
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