Provided you've got your discs, ie a boot up disc (if you need one for XP), your XP disc and your driver discs for any hardware attached, it is quite simple to upgrade. With a new drive you will have to FDISK it first to create the DOS partitions. It sounds complicated but is quite simple to do. The disc will then need to be formatted. Then off you go with your installation of XP. If you have DriveImage or similar software you can actaully make a direct image of your old drive without having to do the above. You sometimes get it bundled with the motherboard.
This explains about FDISK
http://home7.inet.tele.dk/batfiles/m...htm&fdisk1.htm If you are in the market for a new drive then ALDI, yes ALDI, have a 250gb Western drive on sale at the moment for £79.99. Look in the Specila Buys section.
http://uk.aldi.com/