Gavin, have you installed the recently (12 Apr-05) re-released 891711?
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~Robear Dyer (PA Bear)
MS MVP-Windows (IE/OE) & Security

Gavin wrote:
is one of those updates kb89171?. had the same sort of impact on my
puter. if it is go into safe mode, get into msconfig and turn off the
kb891711 start-up file - in config sys.