Constitutional Violation
The legal power the judge assumed here borders on a separation of powers Constitutional violation. The judge essentially gave Microsoft the authority to declare war on these computers. There are also some striking similarities to the law enforcement process of obtaining a search warrant, except Microsoft isn't a police force! I won't go into detail, but if you are interested in a more detailed legal analysis, check out the link below:
http://www.modernbandit.com/2010/02/microsoft-cyber-army-judicial-power-to.html