Knowledge base for software setup, errors, and daily tool work.

How to Fix Windows Security Service Unavailable

When Windows Security shows "Service unavailable" or a red banner, your antivirus and firewall pr...

Fix Missing Command Prompt After Windows Update

After a Windows update, you might find that Command Prompt is missing from the Start menu, right-...

Fix Microsoft Teams Installation Error 0x80070005

You try to install Microsoft Teams but get error 0x80070005. This usually means the installer can...

How to Enable Windows Defender via Command Prompt

If Windows Defender is disabled on your system—often due to group policy, third-party antivirus, ...

Fix Windows Security Authentication Error 0x80070035

Fix Windows Defender Can't Connect After Update

After a Windows update, you might see an error that Windows Defender can't connect to the service...