Sandboxie runs programs in remote space which avoids them from making permanent modifications to other programs and data in PC.

Advantages of Isolated Sandbox
• Safe Web Browsing: Running Web browser in safety of Sandboxie means that all nasty software downloaded by browser is trapped in sandbox and unnecessary trivially.
• Improved Privacy: Browsing history, cookies, and cached temporary files gathered as Web browsing stay in sandbox and don't escape into Windows.
• Safe E-mail: Viruses and other nasty software that hiding in email can't break out of sandbox and can't contaminate real system.
• Windows Stays Lean: Avoid wear and tear in Windows by installing software into an isolated sandbox.