combines Comodo's sturdy firewall and state-of-the-art antivirus protection in one suite. Defends your PC against 1 billion executables including viruses, root kits, Trojans, and zero-day attacks. And even with all these great features, CIS is free. Users are also asked to install the Comodo SafeSearch and Ask.com toolbars, so be careful.
works like a transparency layer. Programs write on the transparency layer. When you delete the sandbox, it's like removing the transparency layer the system stays as it was.