There is also a free change tracking tool for Windows systems from Solidcore called S3 Change Explorer.

Re: Track changes on Windows for free.

It has a change timeline feature that provides a visual representation of change activity over time. Change activity can be filtered by file/registry, program making the change, and user making the change. The timeline can be zoomed in or out as desired. It's a cool tool to use when troubleshooting an application and answering your questions about what changed just before the problem occurred. You can download it free from Solidcore here.