Fix High CPU Usage by MsMpEng.exe (Windows Defender)
If your system feels sluggish and Task Manager shows MsMpEng.exe using 30–100% CPU, Windows Defen...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesBitLocker Recovery Key Not Accepted: Step-by-Step Fixes
You enter your BitLocker recovery key at the blue screen, but Windows says it's not accepted. Thi...
Fix Command Prompt SSL Certificate Error: Not Trusted
When you see SSL certificate error: not trusted in Command Prompt, it usually means ...
Windows Defender High CPU and Memory Usage Not Working: Fixes
If Windows Defender is eating up CPU or memory and also failing to run scans, update definitions,...
Fix Chrome ERR_TUNNEL_CONNECTION_FAILED When Using VPN
You're browsing with Chrome and your VPN is on, but suddenly pages won't load and you see
Fix Windows Defender Access Denied in Safe Mode
You may see an 'Access Denied' error when trying to open Windows Defender in Safe Mode. This typi...
Issue queue
SitemapHow to Resolve Windows Update Auth Errors for Domain Users
Fix Microsoft Store Network Error on Windows 11
Restore Windows Search After Turning Off Cortana
Fixing CMD Crashes During SFC and DISM Scans
Fix Task Scheduler Backup Fails Error Code
Windows Update Error 0x8024402c: Causes and Fixes
Fix Windows Terminal Certificate Error After Update
How to Fix '404 Not Found' File Path Errors in CMD
Windows 11 Remote Desktop Connection Failure Guide
How to Repair Microsoft Store Dependencies with PowerShell
Troubleshoot 0x80070643 Windows Security Offline Install
Firefox Secure Connection Failed: Troubleshooting Guide
Fix Microsoft Store Network Error on Windows 11
Restore Windows Search After Turning Off Cortana
Fixing CMD Crashes During SFC and DISM Scans
Fix Task Scheduler Backup Fails Error Code
Windows Update Error 0x8024402c: Causes and Fixes
Fix Windows Terminal Certificate Error After Update
How to Fix '404 Not Found' File Path Errors in CMD
Windows 11 Remote Desktop Connection Failure Guide
How to Repair Microsoft Store Dependencies with PowerShell
Troubleshoot 0x80070643 Windows Security Offline Install
Firefox Secure Connection Failed: Troubleshooting Guide