nag download ka nang OS ng tapos I burn sa CD o sa flashdrive...tapos punta ka sa BIOS set up...I first boot mo ang CD o flashdrive mo...kung saan naka burn ang OS...tapos restart...hintayin ang lalabas nah.. "Press any key.."..at mag press ka nang any key...tapos nah...sa youtube nalang ang iba...hehehehehe...
what windows version yan kuys.. kung windows 8, 8.1, 10.. mas madali.. meron yan recovery option sa advance startup. no need to download OS. and no worries on your device serial number/s.
pero kung win7 yan.. follow mo yung nasa first reply.
If you don't have a CD copy of the OS that you wanna install afterwards you might need to download it; else just insert it on the CD-ROM then follow the on-screen prompts of the installation;
Else download an ISO of the OS that you wanna use; ex: Windows 7 64-bit.iso; [insert linux distro] noarch.x64.iso ;
then flash mo sa flash drive using Rufus or Etcher para maging Bootable USB
then select mo sa boot up yung USB as primary instead yung HDD/SDD, tas follow the installation prompts.