Nasa has confirmed that laptops carried to the ISS in July were infected with a virus known as Gammima.AG.
The worm was first detected on Earth in August 2007 and lurks on infected machines waiting to steal login names for popular online games.
http://news.bbc.co.uk/2/hi/technology/7583805.stm
I’ve done many stupid things in life but I’ve never taken a virus into space. 
Makes you wonder though: Where is the promised Trustworthy Computing?