Apparently NTFS.SYS tripped DEP by attempting to write to a read-only (code) page. If it's caused by software, the most likely explanation is bad data being fed into NTFS by some type of attached driver (anti-virus being the usual culprit), or fairly severe file system metadata corruption. Suggestions:
1) Update or remove (as a test) your AV solution.
2) Full CHKDSK /R on all NTFS partitions.