Problem reading NTFS partition

Knoppix boots ups from CD, installs all hardware and works fine. But...

I have three partitions on the hard disk, all with NTFS. Knoppix can read the two of them, that have the "Everyone read" permission. However, when I try to open the third partition, which has stronger NTFS permissions ("Read" permission only for specific accounts), the disk appears empty (it mounts automatically, it's just empty when I open it with a disk explorer).

Is there any way to read this partition? Could I somehow supply a valid Windows 2000 username and password in Knoppix, so that I have access to the filesystem?