explorer 6.0

Posting the error would have been a big help.

So,my guest would be that IE is corrupt or the security settings have been changed

Open IE click on Tools menu,select Internet Options from drop down,click the security tab and make sure that you have it set for default.

The other option by troubleshooting is open Control Panel,select the Add/Remove Programs icon,in the window that appears select IE and click on Remove,you will get the option to repair.
You will have the option to restore to previous version,only use if you cannot browse the web,after this you can rerun setup to latest version

Check your internet security settings they might be sight to high. Place them on medium see if that helps.

Go to Tools menu in IE and select internet options and select connections tab. Chk whether u set any proxy settings.Apart from that as per the previous answers chk the secutiry chk levels and also the restricted sites list.