Using Windows XP Professional SP2 and SP3 with Internet Explorer 6. Upgraded to SP3. Then removed SP3. Goggled for advice and found hundreds of posts and numerous Microsoft workarounds---nothing works. I beileve that the installation is either being blocked for security purposes or the Windows installation agent is not performing correctly. Rather than troubleshoot dozens of approaches, is there a clean way to install Internet Explorer 8? I have spent two days on this already and the workarounds so far have not been successful. I am able to install other Microsoft updates without any problem. Thanks.