However, It installaed successfully:
Doesn't look like it did. It looks like the client has installed not the server. The system requirements for SQL server:
Supported Operating Systems: Windows 2000 Advanced Server; Windows 2000 Professional Edition ; Windows 2000 Server; Windows Server 2003, Datacenter x64 Edition; Windows Server 2003, Enterprise x64 Edition; Windows Server 2003, Standard x64 Edition; Windows Small Business Server 2003 ; Windows XP Home Edition ; Windows XP Media Center Edition; Windows XP Professional Edition
Are you sure you have a valid version of Windows 2000?