Malware 'hijacks Windows Updates' / BBC News, 16 May 2007
http://news.bbc.co.uk/1/hi/technology/6657677.stm
"Virus writers may be able to smuggle malicious files onto a computer using Microsoft's security patch updates, experts say.
At least one program is in circulation that can hijack a key component of Windows Update to introduce malicious software that could be used to hijack a computer."