Expired security certificate for some secure sites

A mate of mine keeps getting security certificate errors when accessing secure sites (image hopefully attached) using WinXP Pro & IE version 6.0.2800.1106.xpsp1 (with Q328970 & Q324949)

Does anybody know a way to stop these pop-ups from popping up?

Thanks in advance for any help :)
 

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Have him check IE-> Tools-> Internet Options-> Advanced and see if he what he has checked for certificate checking under Security.
 
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