I'm having some issues with game control. I click on the ground or the corner of the screen but the characters don't walk.

This makes it impossible to reach certain things, like the stalactite or the mouse hole in the prison, because I can't see that side of the screen.

Any suggestions why this might be happening?

Cheers.

This problem is commonly caused by your graphics card not meeting the minimum requirements of the game, mainly Shader Model 2.0 support. You will need a fully DirectX 9.0c-compatible, dedicated graphics card. Integrated notebook chipsets are not supported.