I'm not clear where the Backup.bkf file is, but I suspect it is on your old IDE drive. In fact, I think that may be the ONLY HDD you have that is usable now. So we'll assume you cannot afford to lose any data on that IDE HDD. That means you can't do a fresh install to it.
You could do a fresh install from your XP disk to the new SATA drive with all the new components in place. That is the cleanest route, although it also means you'd have to spend time re-installing all your app software and copying over old files from the IDE drive. If you go this route, at the time you do the install, connect ONLY the SATA drive - leave your old IDE drive disconnected to eliminate any possibility of damaging its data.
BUT a fresh install like this has one major drawback. Your XP disk has original version with no SP's included. This means it does NOT support any HDD volume over 128 GB. So if you install from that disk, it will make the first Partition on your big SATA drive no more than 128 GB, and install to there. Now, that is still usable IF you like the option. What it means is that, AFTER you do the installation, you update XP to SP3 and it will become capable of handling larger HDD's. Then you can use the Unallocated Space remaining on your SATA unit to create one or more additional Partitions, each of which will simply be treated by Windows as separate drives with their own names. BUT your C: drive (the 128 GB first Partition) can NOT be made to expand to use up the whole SATA space unless you use some third party Partitioning software like Partition Magic. So, if you want to have that one HDD contain a 128 GB C: drive with your OS, plus one or more additional drives for data etc., that works.
On the other hand, if you want the SATA drive to be one large volume (500 GB or whatever it is), there are two routes. One is to read up and do what's called a Slipstream process (perfectly legal). You download some instructions, some files, and some software tools to your existing drive. Then basically you take your original-version XP Install disk (fully licensed already) and copy it to your existing HDD, then modify all its files to become an image of a new XP Install Disk that includes SP3 and all the latest updates. Finally you use that to burn a new XP Install disk yourself on a CD-R and use that as your Install Disk. Since the new CD-R disk has all the latest stuff including support for larger HDD's over 128 GB, you use it to do your fresh install to the SATA drive (disconnected IDE drive, remember?) only this time you CAN make the C: drive the full capacity of your SATA unit.
The other option, as discussed before, is the step-by-step upgrade. Use only the IDE drive. Install the new mobo and its CPU, etc., along with ONLY the old IDE drive. On first boot-up, use you old XP Install disk (or maybe those other disks you made) to do a Repair Install to replace drivers with what is needed by the new hardware. Then update drivers further with whatever came with your new mobo, and / or what you can get from that new mobo's website. Then finally you install the SATA drive in the system, setting it to use IDE Emulation mode on the port, and use Acronis True Image WD Edition to clone everything to your new SATA unit. In doing that last step, make sure to tell it NOT to make the clone the same size as the original IDE drive; make it take up all the space available on the new SATA drive, and make it a bootable drive. Then finally you can change BIOS settings so that the SATA unit takes over as the boot drive called C:, and the older IDE drive is given a new letter name.