It looks as though the laptop is not recognising the hard drive, there is no hard drive fitted or there is a hard drive but the OS boot record has been wiped ( I know this sounds obvious but some people buy these 2nd hand only to find the hard drive was removed)
You need to check the hard drive is present by booting to the bios screen it should "see" the hard drive attached. If it is present, then you have a problem with the OS or a damaged hard drive. I think its DEL or F2 or F10 to access the bios, not certain.
At this point, you need to attempt to reinstall the OS, as this does not have an optical drive, you will need to obtain a USB Optical drive, go into the bios and see that it is recognised as a boot device. Do not worry about setting the boot order, the Bios will locate the rom as a boot device.
Attempt a start up repair, ie: wait until the installer looks for a previous installation of windows (if one exists) then allow it to install a repair installation. If it does NOT find this, you will need to doa full install. If at this point you have files you need recovering, a strip down of the netbook and removal of the hard drive will be necessary. You simply then get someone with a computer to jumper your hard drive as a slave and recover the files you need, as a full install requires the hard drive to be fully wiped.
Replace the hard drive after you have done this and proceed with the full reinstall
You can use a USB boot device, but to do this you will need to have access to another computer to make the boot installer:here