When Windows Defender tries to start at start up, or I try a manual scan i receive this message: Application failed to intialize: 0x800106ba. A problem caused this program's service to stop. Restarting the computer did not work. Do I need to unistall Windows Defender and reinstall? HELP hemiguy

Hi hemiguy,Are you using Beta version of Windows Defender? If so, please refer to the KB 930522:http://support.microsoft.com/kb/930522/en-usAdditionally, for your information, we have a dedicate Windows Defender newsgroup as well:Newsgroups for Windows Defender: Learn and share informationhttp://www.microsoft.com/athome/security/spyware/software/newsgroups/default.mspxSincerely,Joson ZhouMicrosoft Online Community Support