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: 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.

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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.

In this case, you cannot write to the folder.

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To work around this issue, use one of the following methods.

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Method 1: Move the "Temporary Internet Files" folder back to its original location

To complete Method 1 on a Windows Vista-based computer, follow these steps:

1.	Click Start , type Internet Options in the Start Search box, and then click Internet Options in the Programs list.
2.	On the General tab, click Settings in the Browsing History area.
3.	Click Move Folder.
4.	In the Please select a folder to which you can add items navigation pane, locate the following folder: C:\Users\User_Account_Name\AppData\Local\Microsoft\Windows
5.	Click OK two times.
6.	When you are receive the following message, click Yes: Windows will now log you off to finish moving Temporary Internet Files. Do you want to continue?
7.	Log on to Windows Vista again.

To complete Method 1 on a Windows XP-based computer or on a Windows Server 2003-based computer, follow these steps:

1.	Click Start, click Run, type inetcpl.cpl, and then click OK.
2.	On the General tab, click Settings in the Browsing History area.
3.	Click Move Folder.
4.	In the Please select a folder to which you can add items navigation pane, locate the following folder: C:\Documents and Settings\username\Local Settings
5.	Click OK, click Apply, and then click OK.

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Method 2: Grant permissions to the "Temporary Internet Files" folder

To complete Method 2 on a Windows Vista-based computer, follow these steps:

1.	Click Start , type Internet Options in the Start Search box, and then click Internet Options in the Programs list.
2.	On the General tab, click Settings in the Browsing History area.
3.	Click View Files. The "Temporary Internet Files" folder opens.
4.	In the Windows Explorer address box, click the folder name that comes before Temporary Internet Files.
5.	Click Organize, and then click Properties.
6.	On the Security tab, click Edit.
7.	In the Group or user names box, click the name of the affected user. If the name of the affected user is not listed, follow these steps: a. Click Add. b. In the Enter the object names to select box, type the name of the affected user, and then click OK. c. In the Group or user names box, click the name of the affected user.
8.	In the Permissions for User_Name box, click to select the Full Control check box under the Allow column.
9.	Click Apply, and then click OK.
10.	Close Windows Explorer.
11.	Click OK two times.
12.	Start Internet Explorer 7.

To complete Method 2 on a Windows XP-based computer or on a Windows Server 2003-based computer, follow these steps:

1.	Click Start, click Run, type inetcpl.cpl, and then click OK.
2.	On the General tab, click Settings in the Browsing History area.
3.	Click View Files.
4.	In Windows Explorer, move to the folder that contains the "Temporary Internet Files" folder.
5.	In the right-pane, right-click an empty area, and then click Properties.
6.	On the Security tab, click the name of the affected user in the Group or user names box. If the name of the affected user is not listed, follow these steps: a. Click Add. b. In the Enter the object names to select box, type the name of the affected user, and then click OK. c. In the Group or user names box, click the name of the affected user.
7.	In the Permissions for User_Name box, click to select the Full Control check box under the Allow column.
8.	Click Apply, and then click OK.
9.	Close Windows Explorer.
10.	Click OK two times.
11.	Start Internet Explorer 7.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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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.

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