Version 7 is supposed to support XP fully, but some of the earlier versions work partially. We use 6 on a server to image preloads that have not done the final install or converted to NTFS. This works well for a post production environment, but would wreak havoc for a normal user wanting to backup data. I've heard that Drive Image 2002 does a better job with XP than Ghost. From Symantec's site, it doesn't look like they are allowing upgrades from non-retail/corporate products.
If the partitions are FAT32, you coud try to image and restore to a different disk, then FDISK /MBR. It may work for you, but we didn't have any luck with it. If it's NTFS, you'll definitely need either Ghost 7 or Drive Image 2002.