Exploit virus?

When I go to the site http://www.zeeuk.com/ in IE 7, the AVG 7.5 informs me of threats found (Exploit), which it can not heal. I run the AVG test and it finds two or three exploits which it can not heal. But there are no malfunctions as such, at least not to my knowledge, and a new AVG test does not find the Exploit.

It was, however, suggested when I googled that this may not occur if I use Mozilla Firefox. I went to the site in Mozilla, and it opened normally, without the "threat found". Just wondering if the Exploit is a serious virus, and how come I do not get it when I run Firefox.

This happens on both my computers, one running Vista Home premium and another XP Home SP2.

Many thanks.

 

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