Internet Explorer - Application Not Found - Mozilla

If a user has ever attempted to run IE7 Beta1 in an unsupported side-by-side configuration with a version of IE6, IE7 Beta1 puts a registry key on the machine the first time a user executes the IE7 version of IEXPLORE.EXE. This key is part of an normal IE7 installation on XP, and will not be configured correctly if an unsupported side-by-side install is used. When IE7 is installed using the installer, the key should be removed properly upon uninstall. A machine can also load this registry key and not remove it during a failed IE7 installation.
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