OEM version is the version provided by Microsoft to computer manufacturers, such as notebook computers or branded desktops. They will pre-install the OEM version of WINDOWS before production, and these vendors have to pay Microsoft. The OEM version determines whether it is genuine or not through the specific code of the BIOS unique to the brand machine. For example, if you buy a Lenovo computer and the computer gives you an OEM system CD, it is genuine when installed on Lenovo's computer, and pirated when installed on other computers, so it cannot be activated!

GHOST version is a mirror file packaged by WINDOWS enthusiasts by modifying, deleting and simplifying some settings in WINDOWS. Due to personal technical problems, deletion may have side effects on the system, so it is better to use the installed version of WINDOWS!