Ie Opens randomly / open blank links

HI,

i have a user that were on a certain closed down site, now at random ie opens that page, either while you have ie open or closed, when she comes back at the pc the page is open...i deleted all of her cookies, cleared history, looked for the url in the registry (could not find that), still the same story...
/
another users ie 5.5 only opens a blank page when certain links on webpages are followed??? had a look but cannot find antything indicating this behaviour..

Kind Regards,

Thys