Suren Gundumalla is correct. You can install the SPC on the same system if it meets the minimum requirments and then make the client managed.
Symantec Protection Center system requirements
* 32-bit processor: 1-GHz Intel Pentium III or equivalent minimum (Intel Pentium 4 or equivalent recommended)
* 64-bit processor: 2-GHz Pentium 4 with x86-64 support or equivalent minimum
Intel Itanium IA-64 is not supported.
* Operating systems: Windows 2000 Server, Windows XP (32-bit, 64-bit), Windows Server 2003 (32-bit, 64-bit), Windows Server 2008 (32-bit, 64-bit), Windows Small Business Server 2008 (64-bit), or Windows Essential Business Server 2008 (64-bit)
Windows Vista (32-bit, 64-bit) is not officially supported.
* RAM memory: 1 GB of RAM minimum (2 GB of RAM recommended)
* Hard disk: 4 GB or more free space