like with beta 1, Spybot 2.0 beta 2 requires WinXP or higher to install and use; it won't install/run under any version of Windows less than XP.
PepiMK and the other developers of Spybot need to decide by either the RC or final release of Spybot 2.0 whether to support Win2000 or not.
edit: I'll try to test out beta 2 on one of my XP machines later today and see how well it works.