Mercola Page Locked up my computer

Dear Chava,

Are you sure the Dr.Mercola website is perfectly safe?  I had to CANCEL out of a box that asked me for my E-mail address.  I searched and got a reference to a page on raw eggs and salmanilla. But the box popped up again.  When I tried to back out of the site, back arrow, the Mercola site was locked in.  When I tried X out, top right, the Dr.Mercola Webpage would not close.  I had to Control-Alt-Delete to get out olf the Mercola website.  After that, My computer was running slow.  I deleted all my cookies and internet files and re-booted.

Are you sure that site is OK?  I have Norton Antivirus.