Further to my last post, for those of you concerned about the Sony DRM rootkit you may be happy to know that the Windows Defender (was the Microsoft Anti Spyware) tool has a signature for dealing with the software.

http://blogs.technet.com/antimalware/archive/2005/11/12/414299.aspx

You can get Windows Defender at http://www.microsoft.com/athome/security/spyware/software/default.mspx

Enjoy!