Ray

Primasoft. You are mixing data files with your system files,
which goes against the principles of partitioning. They are
very large files, which are presumably constantly changing
so they will fragment rapidly. Does the Primasoft programme
not allow for data files to be placed elsewhere leaving the
programme files where they are?

Many advocates of partitioning put the pagefile in it's own
partition, with that partition being the first partition on the
second drive. You need, however, to keep a small pagefile
on the "Windows" drive.
http://aumha.org/a/parts.htm

Your g partition with only 1 mb free space looks odd
without knowing the partition size and purpose!

Moving the Primasoft data files could reduce the frequency
of running Disk Defragmenter on your system partition. It is
certainly worth trying.

Ray

The 5 gb free space is most likely scattered all over the drive /
partition. Some third party Disk Defragmenters can make the
free space contiguous but the utility provided with Windows
XP cannot. What you have done will to a certain extent
circumvent this limitation.

Lack of contiguous free space is a reason why system restore
points commonly feature as a multi fragmented file in the list of
fragmented files.

To give you an obvious example of database fragmentation, subscribe to
microsoft.public.windowsxp.general for a few weeks.  Download headers 1000
each day.  No need to read any of it.  Once a few weeks has expired, defrag.
Download the next days headers, close your newsreader.  Then check
fragmentation again.