The computer shoulda came with a disk and that would be your operating system disk so put it in, then start your computer and if it doesnt boot to the disk, then hit F2 and change the boot options and make it boot from the disk and so when it does boot, then thats when u can reinstall windows back to factory settings but i dunno about advent notebooks. in HP tho, u can do it from the start menu cuz the reinstall settings are already on your computer so ya dont need the disk