When setting up win 2000, My drive was partitioned as one big drive,
using all space on it.

Is there a way I can partition that drive C:\ into 2 drives, Drive C:\
and D:\
?

Yes, with a partition manager such as Acronis. There are some
free ones around too.
To avoid ambiguities, you might want to change your statement
"my drive was partitioned as one big drive" to
"my disk was partitioned as one big drive" for your next post.

How to Get Rid of Multi-boot WIN 98SE Option Leaving Only WIN 2000?
W2K Frozen in Place
Bad problem!
Heur/malware
Problems with installing win2000 server on new Dell
Repeating log on screen. Can not log on
AfterAd-Aware SEremoval, still appears
Setting the Clocks Back and Windows 2000?
Task Bar Problem
Slow logon to desktop - winlogon ?