If your Thinking of install Windows 2000 Service Pack 3 or have already and are having problems I suggest that you check out this site.

Windows 2000 Service Pack 3 has been officially released and is a a recommended upgrade according to Microsoft. It includes a collection of fixes in the following areas: application compatibility, operating system reliability, security, and setup. Windows 2000 SP3 includes the updates contained in Windows 2000 Service Pack 1 (SP1), Windows 2000 Service Pack 2 (SP2) and Windows 2000 Security Rollup Package 1.

Windows 2000 Service Pack 3 Resources