Hi,
This is all what you require:
Supported Operating System
Cisco Secure ACS for Windows Servers 3.3 supports the Windows operating systems listed below. Both the operating system and the service pack must be English-language versions.
Windows 2000 Server, with Service Pack 4 installed
Windows 2000 Advanced Server, with the following conditions:
with Service Pack 4 installed
without features specific to Windows 2000 Advanced Server enabled
Windows Server 2003, Enterprise Edition
Windows Server 2003, Standard Edition
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Note The following restrictions apply to support for Microsoft Windows operating systems:
We have not tested and cannot support the multi-processor feature of any supported operating system.
We cannot support Microsoft clustering service on any supported operating system.
Windows 2000 Datacenter Server is not a supported operating system.
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Please refer to the following link for more information:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_soft/csacs4nt/acs33/win33sdt.htm
Thanx & Regards