http://www.infoworld.com/d/security/rootkit-infection-requires-w
ndows-reinstall-says-microsoft-398

A new variant of a Trojan Microsoft calls "Popureb" digs so deeply into the
system that the only way to eradicate it is to return Windows to its
out-of-the-box configuration, Chun Feng, an engineer with the Microsoft
Malware Protection Center

Details:
http://blogs.technet.com/b/mmpc/archive/2011/06/22/don-t-write-i
-read-it-instead.aspx

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