You don’t need to remove unbuntu just put windows xp and format the drive that should do the trick.

Insert the Windows XP CD and reboot the computer. You will briefly see something about wanting to boot from the CD. When you see this, hit any key and you will be taken to the process of installing Windows XP. Go through the steps and it will work. I’ve done this before.

Off the top of my head i can not think of the precise details of how its done.

But more or less follow the vista onto XP tutorials as the installation process is pretty much the same.

Create i second partition (unless you have two hard drives in your computer, is that what you where saying in your question?) and install on the blank one. Not to tricky if your good with computers. Mildly tricky if you not.

Remember to back up important data first.

You should try checking the CD-Rom connectors to your mainboard, maybe their burnt having power to your CD-rom doesn’t means its working.

Hhmm at worst borrow your neighbour/friends CD drive for like half a day and hook it up to your system at least you can re-install the windows and some basic software that u require.

I wont say how to get it but there’s a lot of sources on the internet to get a working windows xp which is not genuine