Does not Windows XP have builtin Sandbox?

[Guest]

When you right-click on a .exe file in Windows XP a menu appears which says "Run as...", if you click on it a dialog comes up.

With a checkbox that says [x] "Protect my computer from unauthorized program activity."

"This option can preventcomputer viruses from harming your computer or personal date, but selecting it might cause the program to function improperly."

[Guest]

Nobody knows?