I am using Windows Vista 64Bit. Recently after Windows Update I facing a weird error related to Windows Defender. It is not working at all. The error number is 0x800106ba-0x80092003 which appear on startup. I tried to find some information on this error remember on Microsoft Knowledge base. It was clearly mentioned that I have to remove and reinstall Defender to stop error. But I cannot locate option to remove and re-install stuff back again. There is no method available to perform the action. What should I do to get this error fixed. Thanks.