My windows internet browser has been shutting down every time I close down a pop up from that window.  It has just RECENTLY begun giving me a security certificate question asking if I want to continue.  when I click yes it will not take me any further and closes out.  Is this viral or can I adjust my settings somehow?What Internet Explorer Version is this?

Also, what website does it prompt the certificate question?Its version 6.0 internet explorer and it occurs when I try to download itunes newer version from the apple website.  I have downloaded a previous version of itunes with no problems.  I just downloaded firefox and I'm not having problems with the popups shutting down when I close them out but it still will not let me download itunes version 8Let me be more specific. The security question pops up on any secure site...ebay, paypal, banking, etc., it says the certificate is out of date even though when you VIEW the certificate dates are with in the correct range. This is a new PROBLEM that has just started over the last few days. It is not RELATED to the problem of the browser window closing. The browser closing has been a problem for months, but manageable by not closing any windows until you are done with browsing.  If you inadvertently close a window or the site does it for you (as in a calender pop up, etc.) then they either all close down or it quits responding and I have to end TASK in task manager. Hope this explains my delimas a little better.
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it says the certificate is out of date