Troubleshooting Posted on by Webmaster IT Support Forum › Forums › Antivirus › Microsoft › Windows Defender › Troubleshooting This forum has 5 topics, and was last updated 7 years, 1 month ago by Webmaster. Viewing 5 topics - 1 through 5 (of 5 total) Topic Voices Posts Last Post Windows Defender Using 100% Disk On Windows 10 Started by: Webmaster 1 1 7 years, 1 month ago Webmaster The application Couldnt' Check For Virus Definition Updates – Windows Defender Started by: Webmaster 1 1 7 years, 1 month ago Webmaster Unable To Stop Windows Defender Service – Windows 10 Started by: Webmaster 1 1 7 years, 2 months ago Webmaster Microsoft Security Client Error Code 0x800b0001 Started by: Webmaster 1 1 7 years, 2 months ago Webmaster Windows Defender Is Not Updating – WSUS Started by: Webmaster 1 1 8 years, 6 months ago Webmaster Viewing 5 topics - 1 through 5 (of 5 total) You must be logged in to create new topics. Log In Username: Password: Keep me signed in Log In