Outlook Web Access "error on page" after McAfee Internet Security 6.0 install

Hello,

I installed McAfee Internet Security Suite 6.0 on my brother's 8300 this past weekend.  (He originally had Dell Security Center by McAfee, but I realized that for the price needed to renew its three parts, he could also have SpamKiller as well.)  Everything seemed to be fine, except when he accessed his work e-mail via Outlook Web Access.  When clicking on other folders, he will get "error on page" in the lower left of the IE 6.0 window.  He is also unable to open or reply to e-mails in his Inbox.  A recycle to the page makes it possible to get to the other folders, but there is still no response to clicking on Inbox e-mails, and even clicking on the "Help" link (just to get the OWA version number) resulted in "error on page".  I was able to click "New" and create and send myself a test e-mail, and to send back a test e-mail reply, but still couldn't open it from his Inbox.  Please help!