need to unistanll ubuntu

Unfortunately, to reinstall Windows, you'll need a installation CD, which costs upwards of $100. and when reinstalling, boot into the disc by selecting the option to boot from your CD/DVD drive from the BIOS.

kind of ridiculous that he is required to use windoze. if he installed ubuntu, he probably did it for a good reason. seeing that a lot of programs for windoze have equivalent ones in ubuntu, it shouldn't matter.

you'll probably be glad that he did, seeing that software costs money and the school might require him to buy them.

If his computer originally came with Windows, it might have shipped with CD's or DVD's to reinstall Windows and the computer's Windows drivers. If it came with Windows but those CD/DVD's were not included, you/he should be able to order the Windows CD/DVD for that computer from the computer's manufacturer. The serial number to enter during installation is probably on a sticker on the computer (but might instead be pasted to the associated documentation, and on some manufacturers the manufacturer-supplied Windows installer CD doesn't require that a serial number be entered).

With that said, perhaps you and he should talk to the administrators/teachers at the school, since requiring Windows is an invasive and, for many people, financially onerous requirement.

Finally, please note that if he wishes to continue using Ubuntu as well as Windows, he can set up his computer to dual-boot them, by shrinking down the Ubuntu system to make room for Windows, installing Windows, and then following the procedure to restore the GRUB boot loader (before which the Windows installation will render the Ubuntu system temporarily inaccessible). This will still require a Windows installation CD, though. Some manufacturer CD's restore the computer's hard disk to its *original* state (in which Windows is installed), rather than actually installing Windows, and if that is the case, then this would destroy the existing Ubuntu system (but the restored Windows system could still be shrunk down and Ubuntu could be installed alongside it).

@eliah
in north america, computers haven't shipped with installation disks in over 10 years. factory settings are saved in a hidden recovery partition. however, installing ubuntu may have deleted it

@dj
like i said previously, your son probably knew what he was doing. kids today are way more tech savvy than their parents. anyways, netbooks only have the crippled windoze 7 starter. in my humble opinion, having ubuntu is way better than windoze. i had windoze starter 7 on my toshiba netbook. the temperature was 55C (131F). switching to ubuntu, the temp dropped to 82F at startup and maximum of 118C. quite a difference from 131F.

seeing that they use the netbook more intensely at school than you do at home. he made a wise move.

i'm sure the people who said he is required to use windoze are microshaft drones who were brainwashed at an early age.

@marcus
I live in North America, and I know several people who have bought computers (produced by major manufacturers) within the last 10 years that shipped with installation media. One of them bought a Dell computer about a month ago, and it came with installation media. I also know people who have bought computers and not received their installation media (and I am myself such a person). Sometimes there's a recovery partition and sometimes there isn't, but I'm operating on the assumption that, in this case, if there was a recovery partition, it's gone now. Even in cases where a computer ships with a recovery partition and not installation media, it is usually possible to order the installation media from the manufacturer at minimal cost.

If you wish, I will consult these people about the computers they have purchased, and furnish specific details about computers that ship with installation media. (Please note that my claim that their computers shipped with installation media is not based on hearsay--I physically helped them set up their computers, and saw the [re]installation discs.)