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

Windows Defender Not Opening? Here's How to Fix It

You click the Windows Defender icon, but nothing happens—or you get an error saying the app didn'...

UFW Port Closed Despite Allow Rule: Fixes

You've added a UFW allow rule for a port, but a port scan or service test shows the port is still...

Fix 'Windows Activation Command Not Found' by Checking System Files

When you run slmgr.vbs or cscript slmgr.vbs to activate Windows and get...

Fix Windows Search Blank Screen Error 0x80070002

If you open Windows Search and see a blank screen or empty results along with error code 0x800700...

How to Fix Chrome 404 Not Found Error When Loading a Page

You’re browsing in Chrome, and instead of a page, you see 404 Not Found. This us...

Fix BitLocker 'Cannot Access Drive Permission Denied' Error

Understanding the Error

You see 'Cannot access drive. Permission denied' when trying to o...