Why doesn't Spybot Search & Destroy version 2.0 Beta 1 not work on Windows 2000 I get a error that says "This program requires Windows NT version 5.1.2600 or later." I tried to install it on a fully updated Windows 2000 with Service Pack 4 and with Roll ups [Version 5.00.2195]

Other very good anti-spyware programs work very well on Windows 2000 such SuperAntiSpyware and MalwareBytes' Anti-Malware. I hope you are not forgetting that there are still a lot of computers that are not running the latest wiz-bang version of Windows, Some computers have to use older OS versions because of special proprietary software that will not run on newer versions of Windows.