This is what {moderator edit} other popular defrag sofwares do -
they IGNORE the immovable files in their Analysis. Since locked files, like System Restore Points in Vista and Win-7, cannot be processed - it makes sense to exclude these files from the Analysis.
Otherwise, the Analysis Results are giving a skewed, misleading estimate of 'fragmentation': Only movable files can be defragmented - it is fragmentation with movable files that indicates true fragmentation of the file-system.
I've used Piriform Defraggler for years - but have found the misleading report given by Defraggler's Analysis, to be unhelpful. Only in Windows XP is the System Restore area of the disk, able to be defragmented.
In the higher versions of Windows, these files are locked by the Operating System. Reporting fragmentation of these files is misleading, since they cannot be moved while Windows is running.
Thx for your kind attention,
-- Randy