Its official: Avoid Microsoft Explorer
See http://news.bbc.co.uk/1/hi/technology/7784908.stm
Sighhhhhh. The media run these kind of stories now and again. Real life is just not risk free. Just be sensible about the sites you visit - as you would walking out in tough streets. And keep your anti-virus updated!
Perhaps a good time to consider Linux?
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http://www.kb.cert.org/vuls/id/493881