Can i reinstall os on laptop without the hard drive

Operating System needs a hard disk drive, you can run the software or installer but you can not install the operating system. It's no for me!

Unfortunately no. You need a hard drive. But if your laptop supports it, you may be able to use a USB Pen/Flash drive to act as your hard drive and load an OS onto it if it's large enough (16Gigs or larger).

If you turn on the laptop and at the beginning Post screen, press the key that will take you into Setup/BIOS. Look through the pages to find references to booting from a USB drive and set that (If your laptop has that ability) as your second boot device with the CD/DVD Rom drive as the first boot device.

Have the USB pen drive inserted and then start the windows OS setup with the CD/DVD. You would need that drive plugged in each time you use the laptop and cannot remove it for any reason once it's loaded into windows. You can remove it once it is shut down though. This is a long shot and not a recommended solution.

Hope this helps.

If it's Windows, no not without a drive...maybe if you have a large jump drive, but you need something for windows to install on.