Newest IE7 Patch Can Disable Browser
Microsoft on Thursday said it was working to resolve a minor problem caused by its latest cumulative update for Internet Explorer 7, which can prevent the browser from opening altogether. The issue occurs when customers change the default "Temporary Internet Files" after installing the patch.
According to a new Knowledge Base article on the matter, users may see the File Download – Security Warning dialog box raised when starting IE. Once the box is closed, IE7 cannot be started because permissions on the custom temporary files directory are not the same as the default. Users can change the directory back, or update permissions on the new directory in order to regain access to IE.