This means that the file that the system downloaded didn’t match the SHA1 hash of what was in the Fixlet.
You can test this manually by downloading the file put it on at C:\ (or wherever) and running the relevance:
(size of it, sha1 of it) of file “C:\office2003-KB957784-FullFile-ENU-CSA.exe”
Then compare this to the size/sha1 inside the action of the Fixlet… I would check this for you, but I am out-of-the-office and I lost access to my server temporarily.
If they are different, let us know and we can take a look into it…