How do I get rid of a failed W2k upgrade install?

I did a W2k upgrade installation over my 98se. The second attempt succeeded but left me with a failed first attempt still on the system. I used the method of going to system properties to select my default OS so I don’t have to choose which OS to startup. However, I would like to get rid of the failed OS because it is just taking up hard drive space and who knows what other problems it may be causing.

Can anyone help me?

Thanks,
George