Firstly you shouldn't consider anything like doing this until you have created a set of recovery discs using software already installed on this device.
PCs of any type that do not come with any discs always have software installed to allow creation of these recovery discs.
Check your Manual for information about performing this step.
Check the manufacturers website for information on this.
Also check the programs installed for a program that will do this.
After you have done this THEN and ONLY then can you consider replacing the OS with XP.
FAILING TO DO THIS WILL RENDER IT IMPOSSIBLE TO RESTORE IT BACK TO ORIGINAL STATE.
You will need to get into the BIOS and set the device to BOOT first from CD.
Then you can perform an XP install.
Check the Manufacturers website and see if they list any XP drivers for the device.
Failing that look for specifications on the manufacturers website and see if the various devices are listed, eg, chip set, video, sound, wireless etc.
Google these chipsets for XP drivers.
If none are available then none are and you will have a next-to-useless G Notebook without them.