Security IDs for Files on Disk Incompatibilities?

Hi Folks,

I have Windows 7 RC1 and Windows XP Home in separate primary partitions as well as a common "data" partition and a dual boot system all of which seems to work well apart from one issue.

If either operating systems are flagged to run chkdsk due to "dirty" partition, it always finds errors for many files and performs a:-

"Replacing invalid security id with default security id for file XXXXX"

This repair often messes up NTFS and/or share permissions for the "other" operating system so I am wondering if the file security IDs are incompatible in some way.

Any comments would be most welcome.

Cheers from Mike