
How to Reinstall the Windows Security Module
If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...
Software troubleshooting desk

If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...

When setting up an email account in Outlook, an SSL certificate error can block the connection. Y...

You try to open Chrome and get a message that your profile is locked, or you can't sign in. This ...

You open Task Manager and see Windows Security (the process is MsMpEng.exe) using 500 MB or more ...

You restart your PC to finish installing updates, but Windows Update gets stuck on a spinning cir...

When migrating Chrome to a new computer or profile, you might see error messages like "Your profi...