"This Operation Has Been Canceled Due To Restrictions…"
From Microsoft Knowledge Base article 894179:
In Microsoft Internet Explorer 6, you may receive an error message that is similar to the following when you try to open the Internet Options dialog box:
This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator.
This issue may occur after you click Open, Save, or Cancel in a File Download – Security Warning dialog box.
CAUSE
This issue occurs because you try to download a MIME-type file that has a Content-Disposition content header.
RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Windows XP service pack that contains this hotfix.”
[Microsoft Knowledge Base article 894179 - FIX: You may receive a "This operation has been canceled due to restrictions in effect on this computer" error message when you try to open the Internet Options dialog box in Internet Explorer 6]





