Sandboxie - (Free)
SandBoxie serves as a shield against malicious actions of potentially dangerous programs.
Sandboxie is a very useful tool for those that want to be safe when running applications to test applications, browse the Internet and manipulate files safely preventing them from making permanent changes to other programs and data in the computer.
Sandboxie may constitute a tool of anonymity and protection against attacks and intrusions. It includes a manager that lists the active processes , manage content in the sandbox and create more secure areas. These shares may be made ​​via the intuitive software interface.
Sandboxie will install a sandbox between the hard disk and applications, the process being very simple: each disk access records in the sandbox and when the software tries to write to the disk, it is actually writing in the sandbox , which prevents change anything on the disk, seamlessly and without affecting performance.
SandBoxie is extremely useful when you want to test software and without leaving traces on the computer.