It is neither totally free-will nor totally predetermination, but in between. Once an action is chosen, its results are fixed—that is—thought is the father of all actions, and you have the freedom to change your thought, hence your actions too. But you have no freedom to choose the results which are arranged by forces of nature—visible and invisible, perceivable and imperceptible!
People have freedom to choose. Hence you have people acting differently in same situations. In poverty some may turn into stealing, suicide, prostitution… etc., yet not all poor people choose to do so, where as some rich people may choose to do those things! Among those who go deep into Science and Philosophy some may become atheists and others may find their faith in God reinforced. Those who work as Air Hostesses and work in the Customer Care Services choose not to get angry even at the face of provocation while on duty, but may choose to get angry with their family members at home! This is true of all other vices! It means virtues are intrinsic to our nature, hence come naturally to us, but vices are performed out of choice, hence come with effort and planning! All these go to show that people CAN change into any direction—from virtuous to vicious and vice versa!
However, results do not seem to be universal and uniform, and duration between action and fruition varies from person to person. Hence many people find it difficult to accept principle of “sow and reap” in religious setting (though everybody accepts it in physical world). Yet it seems to be the only logic to explain this whole creation, its existence and whatever happens. The more one understands it the more amazed and responsible-minded he becomes. One feels inspired to take charge of himself, and to do good that attract good, and finally to avoid doing bad thus avoiding bad results!