upgrading from single to dual processor – windows 2003

Greetings – I have a win 2003 server that I just installed a second processor in. It’s an old Dell poweredge 1300 that I use mainly for authentication and mass file storage. the bois shows both CPUs are good, but I don’t know how to get win 2003 to recognize and use the second processor – I know the second proc prolly won’t do much for me performance wise but i’d still like to know how to do this – I beleive I need to change the hal.dll and a couple of other files, but I’m not sure which hal file to use, and which other files need to be changed, and to what – or, can I do a “repair” with the Win 2003 CD without blowing away my AD environment? This server is the DC and only server in my AD –

Any help would be appriciated –
Thanks