Win XP : Windows Complete PC Backup and Rrestore.

Protecting your computer.
Windows Complete PC Backup
and Rrestore.
Few things can hurt a business more than systems crashing and losing valuable business and customer data. With Windows Complete PC Backup and Restore, you not only can back up your personal documents and files, but also you can back up all of your operating system files and programs—everything on your hard disk drive. In the event of a catastrophic hardware failure, you can use Windows Complete PC Backup and Restore to get your entire computer back to normal in one easy step.

Back up your computer:
Select Complete PC Backup and Rrestore from the Maintenance
file under All Programs on the Start menu.
Click Back up computer.
Select a back-up device (DVDs, external hard disk, etc.).
Click Next, and follow the prompts.

Restore your computer:
Boot from the Windows Vista Ultimate DVD.
Select your language.
Select the Rrepair your computer option.
When you get to the Windows Recovery Environment screen, you will select the Complete PC and Rrestore option and follow the prompts to restore your system.