I'm trying to format my hard drive to do a clean install of 2000. I downloaded a boot disk, it boots from A:, installs the cdroms, and goes to DOS. From there, I can't change to drive c:. It says "invalid drive specification." I can change to r: and s: (my cdroms) but not c: or d: (my hard drives). What's the deal? I've never had this happen before! I even downloaded a different startup disk with the same results. Help??