If you lost or forgot your Windows 10 product key, it's not a problem. You can quickly retrieve it using one of these methods.
If you recently upgraded to Windows 10 Fall Creators Update, you might be facing a weird problem. Every time you restart your computer, an error message appears before the login screen which says 'The user name or password is incorrect. Try again.'.
If you have some issues in Windows 10 which you cannot resolve in the normal mode, there is a way to start it in the Safe mode. Safe mode is a special startup option designed for advanced troubleshooting.
In Windows 10, there is a delay to improve startup after you log on so that startup programs don't open all at once. When Windows 10 is started, it delays the loading of apps from the Startup folder. You can reduce this startup delay for desktop apps with a simple Registry tweak.
These days most PCs can boot from USB, so you need no DVD drive any more to install Windows 10. Installing Windows 10 from a USB flash drive is much faster than optical drive setup. Here is how you can transfer your Windows 10 setup to a bootable USB stick.