Jo,
Depending on how comfortable you are with hardware, you could mount the drive in another system and copy your data off to a safe place. I would burn a DVD / CD with the pictures and other data if you have a burner available.
If you don't have another computer available you could do a repair with the original XP distribution media, make sure you choose repair and do not format. That should get you to a point you can at least back up the pictures to CD or USB media.
You should also contact you OEM before you proceed for advice and best practices to safeguard your data.
-Fred