Change from hardrive E to hardrive C.

​ I did a complete system reboot. Erased all old Primarys. Reinstalled Windows XP, All Dell software, DVD Burnners CD Burnners, etc.. etc... etc.... Now all new hardware is running on E: drive instead of C: drive. Can someone please tell me how to re activate my C: drive. My E: drive is full and won't download any updates because there is know room on the E: drive. I didn't even know I had a E: drive. I only had a C: drive and a D: drive before. Now that my computer is empty I have no room and this is crazy... Help Please!!! ​

​ ​