ntfs mount errors

Further to my problem of not being able to automatically mount my windows xp partition and cd to it as a regular user.

from dmesg:

NTFS driver 2.1.27 [Flags: R/W MODULE].
NTFS volume version 3.1.
NTFS-fs warning (device sda1): load_system_files(): Unsupported volume flags 0x4000 encountered.
NTFS-fs warning (device sda1): load_system_files(): Volume has unsupported flags set. Will not be able to remount read-write. Run chkdsk and mount in Windows.

I'm not clear on what I need to do. I don't seem to have chkdsk. I tried apt-get install chkdsk but that failed because it could not find the package. "mount in Windows" I don't understand. When I boot into Windows the partition is there, obviously. Forgive me if I'm a bit of a daft newbie.

Phill

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