SP3 (not enough space)?

unfortunatly when our win 2k server was installed it was installed on a 2 gig partion out of a 60 gig raid drive and the rest was used for files and when i came in i uninsttaled regular programs and tried to install them on the bigger partion. now that i’m trying to install sp3 i get the enough disk space error since my 2 gig drive is almost full … i need help to either somehow make the partion bigger or use the space on the bigger drive to install sp3