How to boot directly to DOS on a Win XP Pro machine?

Installed a new C: drive and installed new copy of Win XP there.  Moved old HDD to D: in the same machine, and the old installation of Win XP is there also. Want to use the D: drive ONLY for data storage, and get rid of the old Win XP thereon.  I've been able to do that except for the 'Documents and Settings' folder.  If simply try to delete d:\documents and settings from the new XP environment, it says 'access denied.' So I suspect I'll have to boot directly into DOS to get around this.

Can anyone tell me how to do this?

Thanks!

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