How to Move a Windows XP Installation to Different Hardware (Q314070)
IMPORTANT : The issues that are discussed in this article and in the linked articles are the most common problems and limitations that you may encounter when you try to restore a backup copy to different hardware. Other issues can also appear because of the variations in software and hardware configurations. You may be able to resolve any of these issues by troubleshooting the specific problems that occur, but compatibility issues may limit the success of the restore of a backup to dissimilar hardware.
Windows Backup (Ntbackup.exe) can handle differences in hardware configuration information between computers and maintain critical registry entries that are unique to the computer to which you are migrating information. This capability means that you can migrate to new hardware by performing a full backup of the source computer and then restoring the backup over a fresh installation of Windows XP on the destination computer.
Click here for the article.