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ITsVISTA KB-Link: KB935511

Error message when you try to start Windows Defender on a computer that you recently upgraded to Windows Vista: “Application failed to initialize”

When you try to start Windows Defender after you upgrade from Microsoft Windows XP to Windows Vista, you receive the following error message:

Application failed to initialize.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB935511.

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