Malware infection within recently downloaded text code for Programming Python, 4ed.

I've downloaded the code for the text, 'Programming Python', 4 ed. ISBN: 9780596158101.

Each time I download and scan the code with SuperAntiSpware, I receive messages that the archive are infected with Trojan.Downloader-Gen/a.
I am hoping to bring this to your attention.
AVG Free (updated to July 2012) is not catching this when I download the archives.

I'm including SuperAntiSpyware screenshots for you.
Don't know if this is useful or helps.

Good book,

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