Seedless:
Windows XP Professional has two built-in features you can use: the backup program and the ability to burn CDs. To read more, click Start and click Help and Support, then do a search for the words "backup" and "cd burning".
Doc
If you have enough room on your hard drive, you can back up your entire system (excluding the backup folder, of course) to a backup folder. If you don't have enough room to do this, you can back up just the system state, which is an option in the Microsoft backup program.
For regular backups, i'd suggest a full backup followed by daily or weekly incremental backups. If you need more help, let us know.
Best regards,
Doc