Important This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect the computer.
If you are a Small Business customer, find additional troubleshooting and learning resources at the Support for Small Business site.
You install the May 2007 Cumulative Security Update for Internet Explorer
(MS07-027), and then you try to open Windows Internet Explorer 7. After you do this, the File Download – Security Warning dialog box may open, and you may receive the following message:
Do you want to save this file?
The File Download – Security Warning dialog box also refers to the "navcancl" file name.
After you close this dialog box, you cannot start Internet Explorer 7.
This problem may occur on a Windows Vista-based computer if the following conditions are true:
The "Temporary Internet Files" folder is moved to a location outside the User folder hierarchy. For example, the "Temporary Internet Files" folder is moved to another volume.
The Phishing Filter is enabled.
Protected mode is enabled.
In this case, the "Temporary Internet Files" folder has insufficient permissions in its new location. Therefore, the Phishing Filter cannot start. When this problem occurs, Internet Explorer 7 cannot start, and the File Download – Security Warning dialog box opens.
This problem may also occur on a Microsoft Windows XP Service Pack 2 (SP2)-based computer or on a Microsoft Windows Server 2003-based computer if one of the following conditions is true:
The folder that contains the "Temporary Internet Files" folder has been deleted.
The permissions for the "Temporary Internet Files" folder have been changed.
Warning This workaround may make a computer or a network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.
You can also work around this problem by turning off the Phishing Filter or by turning off protected mode. However, we do not recommend that you disable these security precautions.