Boot from the Windows XP CD and let it reformat the drive. WIndows XP cannot use the native Ubuntu filesystem, so you'll need to reformat the drive anyway and you might as well do it using the XP install disc.
Windows XP.
If you have installed ubuntu with windows you uninstall it in the add remove programs.
No.
system -> admin -> users and groups. Or, since this question is in the "Windows XP" category, are you asking how to create a new user on Ubuntu from within Windows XP?
If you chose the option to resize the hard drive to make room for Ubuntu, there will an entry for Windows XP on a boot menu when you start the computer. If you chose to use the entire disk, Windows XP was erased, and recovery is probably not possible.
Downgrade it, you can use a Windows XP install disk to undo the Windows 7 one.
Yes Linux can be installed on the same computer.
Use your Ubuntu CD. Find a program called "GParted" or "Gnome Partition Editor". Click on your XP partition and click "Resize" and make it smaller. Then, do the same with your Ubuntu partition, and drag it until it fills the space left by XP.
Not sure how to answer but Windows 95, Windows 98, Windows, 2000, XP, VISTA, 7, MACOS, Ubuntu and others.
You could make a separate partition for Ubuntu, so creating a dual-boot. Or try the easiest method of using WUBI to install Ubuntu as a Windows file. This allows you to use Ubuntu without affecting XP or the hard-drive. Type WUBI in a browser and follow the instructions.
on windows xp: in the file programs on the local disk
Windows OS: Windows 7 XP Vista Mac: OSX Lion Leopard Chromebook: Chrominium Others: Ubuntu