Hey gjw,
Im glad that the issue is resolved. And for more information , You can very well install IE 8 . The 2009/later McAfee consumer products for Windows Vista disable Microsoft Windows Defender to improve system performance. Windows Vista users who have installed the 2009/later McAfee consumer products should not enable Windows Defender.
Please do start a new thread if any issues .
Regards,
Dinesh K
McAfee Online Community Moderartor