
Windows Stays Lean: Prevent wear-and-tear in Windows by installing software into an isolated sandbox.Secure E-mail: Viruses and other malicious software that might be hiding in your email can't break out of the sandbox and can't infect your real system.Enhanced Privacy: Browsing history, cookies, and cached temporary files collected while Web browsing stay in the sandbox and don't leak into Windows.Secure Web Browsing: Running your Web browser under the protection of Sandboxie means that all malicious software downloaded by the browser is trapped in the sandbox and can be discarded trivially.Traps cached browser items into the sandbox as a by-product of normal operation, so when you throw away the sandbox, all the history records and other side-effects of your browsing disappear as well.Intercept changes to both your files and registry settings, making it virtually impossible for any software to reach outside the sandbox.

Not a major problem for me but a bit annoying. Everything else stays open but the explorers that were open are all gone and 1 or 2 utility programs also are gone (one is to show current month calendar when I hover mouse cursor over clock). I can have a few others running but when I get ready to run a new instance of Firefox in a sandbox I get a message that explorer has crashed and lose all my open explorer windows. Perhaps a conflict with one of the other utilities/drivers/programs running in the background. One minor problem is it seems to cause my explorer to crash every now and then when I try to invoke a sandbox on my 64-bit system (Win 7).

I'm glad I paid to have use of all its features and can't imagine being without it. Although Shadow Defender does take up a small amount they seem to have some algorithm that prevents disk usage from becoming excessive.

The "free" programs will "eat up" your disk space and some change your MBR. Deep Freeze was my favorite but they have an annual fee now. Although not free it more than makes up for the cost by being low maintenance. My preferred program to avoid problems you described is Shadow Defender.
