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

Fix OneDrive Sync Error 0x8004de40 (SSL Certificate)

If you see error 0x8004de40 when syncing OneDrive, it usually means your computer cannot verify t...

How to Fix Windows Defender Update Error 0x80070643

If you see error 0x80070643 when updating Windows Defender, it usually means the update failed to...

Fix Windows Security Authentication Error 0x80070035

Fix VirtualBox Kernel Driver Not Installed Error

When you try to start a virtual machine in VirtualBox and see "Kernel driver not installed (rc=-1...

Fix Windows Defender Service Not Starting (Error 0x80070422)

You try to start Windows Defender but get error 0x80070422: “The service cannot be started, eithe...

How to Reset Chrome Profile Without Losing Bookmarks

If Chrome is acting up—slow, crashing, or extensions misbehaving—you might need a fresh profile. ...