If you have a second partition on the laptop from factory, on Win-XP, it is most likely made by the maker of the laptop. Compaq and Ibm used to be famous for that. But those "secondary" partitions are generally small, containing system or recovery files.
When you have booted with the live-cd, is it possible for you to capture the desktop... with Gimp maybe, and show us what PCLOS sees as partitioning options? Save the capture as a my desktop.jpg, 1024 by whatever, (size limitations on forums). Then under Additional Options, attach it to the post?