When you first install Ubuntu, it will walk you through the steps to install it and keep your other OS installed. Then when you boot your dual-boot system, you can simply select Ubuntu.
Yes, it can be done from the windows installation disk, but it's cleaner if you remove ubuntu with the ubuntu live cd and then install windows.
No. After download and burn the Ubuntu 10.10 install disk, you can either TRY Ubuntu without affecting your Windows at all, or INSTALL Ubuntu to have them both in your PC. However, to install Ubuntu, you need to be careful. Make sure not to install Ubuntu to the Windows drive. That is all.
For any disk OTHER THAN THE ONE YOU BOOT FROM, simply open a command prompt and type: format d: (where "d" is the designator of the disk that you want to format) OR open windows explorer, select "my computer" then right click on the drive you want to format (again, it can't be the disk you boot from" If you want to format your C drive you'll need to boot from some other medium, such as the installation disk or a floppy.
Make sure that the disk uses a format that windows recognizes
You will have less disk space available for OSes.
format /fs:FAT32
Create a dos boot disk. Make sure that it contains FORMAT and FDISK. If you have access to Windows 98 then you can create a boot disk.
Windows 7 and Windows XP are operating systems. You cannot format operating systems. But you can format your hard disk or hard drive. You can use Windows XP bootable CD to format HDD, but you will have to use Windows 7 Bootable Installation disk to install OS on your formatted drive.
Open "My Computer" on the Desktop, right click on the disk you want to format under "Hard Disk Drives" and then click on "Format". Select the required options and then click on "Start"...
You would need to create a partition to install Windows to. Or you can run it in a virtualized environment using Virtualbox by Sun Microsystems. With virtualization you can run Windows or another operating system (OS) of your choice on top of Ubuntu. Of course with either method you will need an install disk of Windows. If you choose to do what is called a "dual-boot" from what I described earlier, you will like I have stated, create a partition into which you will install Windows to. Be careful though when you are working with partitions as it is best to backup all of your data in case of complications. To create a partition from within Ubuntu you may use a program called Gparted. You can install that through your "Applications" -> "Add Programs".
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.
on windows xp: in the file programs on the local disk