If this situation is during XP installation, as opposed to after the XP
installation has fully completed, then the drivers required for the disk
controller in your notebook are not on the Windows XP CD; this is not an
uncommon situation for newer hardware.
The way to solve this is to get the Windows XP drivers, either from a CD
that came with the computer or to download them from the notebook vendors
web site and put them on a floppy disk. Then, during XP setup, when you get
the message/prompt to Press F6, do so. At that point, setup will read the
drivers from the floppy disk and will install them both for use during setup
and while XP is running.
Unfortunaely, most notebooks do not have floppy disk drives. Windows XP
setup does not support loading the drivers from other media (e.g. USB
key/drive), so you may be kind of stuck unless you are familiar with
"slipstreaming" or "unattended installation".
You might try running XP setup from Vista, instead of booting from the CD.
When you do this, you can still choose to install XP into a different
partition. The drivers included with Vista may or may not work with XP, so
this might not work for you.
See if you can find a CD that has Windows XP SP2 integrated on it - this
may have the driver for the disk controller incorporated on it.
If none of this helps, see if you can get help from the notebook
manufacturer.
If you install a version of Windows that pre-dates Vista (e.g. XP), the
Vista boot menu will be disabled and you won't be able to boot to Vista.
This is the reason a lot of people say to install the oldest OS first - it
avoids this kind of issue. Actually, with the new boot process in Vista,
this should not be a problem for Windows version that follow Vista.
However, there is a way to correct this problem, assuming you can get XP to
install and run! The process to fix the Vista boot menu issue is:
1. while XP is running, put the Vista DVD into the drive
2. cancel the "autorun" window for installing Vista
3. open a command prompt window
4. key these commands:
x: [where x is the drive letter for the DVD drive]
cd x:\boot
bootsect /nt60 sys