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After changing a user group, some areas of a Win2k NTFS volume become inaccessible. This is caused by invalid security descriptors. You may notice the desktop resets to the default for users or that you can't reset permissions or the ownership of certain directories even while logged in as an administrator. The fix for this is fairly simple:
1. Run chkdsk /f from the command prompt to schedule a check disk to fix the security descriptor problem the next time you reboot.
2. Log on as an administrator and take ownership of the drive.
3. Reset permissions on the drive.
Also, you can reset the default permissions by following directions in the Microsoft knowledge base article #Q266118.