Memory problem, can't work with Photoshop

Hello, I'm asking on behalf of a friend who bought a new Lenovo TC M91p 2 months ago. Since then she is not able to work with Photoshop. First she had a Photoshop CS2, then installed a Photoshop CS4. This is what she writes about the problem (first she tells me how she did things on her broken Acer running XP to show me how things should work, then she describes the problems with the Lenovo...