I use windows XP. When I try to do system recovery, by pressing F10 when the computer starts up, it has no effect at all, and I can't do system recovery. I've plenty of research and I think I might have deleted my recovery partition. I don't know my partitions, I don't know nothing. How can I do system recovery? I have partition table doctor, and I don't know how to use it.

How can I do system recovery?
It's so stressful. Please help