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<http://www.theregister.co.uk/2009/08/06/vista_anti_virus_tests/>:

John Hawes, anti-malware test director at Virus Bulletin, said its
biggest problem in running its most recent tests were crashes and system
slowdowns.

"Many of the products in this test did prove stable, speedy and well
behaved, but many others had issues far too serious to be classed as
mere quirks and oddities," he said. "We experienced a large number of
freezes, crashes and hangs, not just of the product interfaces or of
specific scans but in many cases seeing the whole machine shutting
down."