Spybot 2.0 is still in beta stage, B Trevathan. dont forget that!
just because Spybot 2.0b1 doesn't support win2k doesn't mean it could stay that way in later beta/RC & final releases.
look what happened to Mozilla Firefox 4.0, for example. Beta 1 of Firefox 4.0 worked under Win2000 BUT beta 2 didn't (a google search on "firefox 4.0b2 win2000" proves this). Mozilla corrected the problem and released FF 4.0b3 & subsequent betas/RCs and Firefox 4.0 now runs on minimum of win2k.
so just wait for either the next beta or the final release of Spybot 2.0 to come out and then check if that one installs & works under Win2000.
bye now, B!