I am the one that suggested Hiren's when you first posted:
I have never made a Hiren's using the Windows 7 burner (only ImgBurn) and when I did try it on 7/20 I could not get the Hiren's to unzip all the way and quit trying (sine you did not report that issue).
I did download Hiren's again today and using the Windows 7 burner and the Hiren's CD I made worked fine for me so I don't know if there was something wrong with my download (and maybe your download) from 7/20 or not... but I downloaded again this morning and used the Windows 7 burner and it worked for me this morning. I usually suggest ImgBurn but the Windows 7 burner seemed to be okay (surprised me).
I still think that you just need to run a chkdsk with error correction either from Hiren's or the XP Recovery Console but you may need to tinker with your BIOS to get the Recovery Console to behave since your system has SATA drives but that is not uncommon. Hiren's doesn't have that issue so that is why I go for that first - no adjustments needed.
If your file system is corrupted a bit (which I think it is), it might not do you any good to work on any other stuff like XP Repairs until that is fixed first.
If you want I can tell you how to make a bootable XP Recovery Console CD (no XP media required) or if your system can boot on a USB flash drive, I can tell you how to make a bootable Hiren's USB flash drive so you can run the chkdsk with error correction. The Sony forum reads that your system should be able to boot from a USB thumb drive (good for systems that don't have a CD/DVD drive).
From your original symptoms, I would still suggested starting with the chkdsk with error correction.