RAID 5

OK, I installed Windows 2000 Server on Disk0 of my server. Now I want to impliment RAID 5, but I can’t. It sees Disk1 and Disk2 but not Disk0 since windows is already installed on it. How do you set up RAID 5 on a Windows 2000 server? I can use the free space from Disk0 but then I get a RAID 5 volume that’s not striping anything?? Please help.