Since I had my new computer with partitioned drive for fs9 I have noticed an increasing amount of 'low performing system files' showing up on my HDD after defragging.What and why are they there?Can anyone possibly help here? Is the HDD on the way out?

Dave,what files are you ref. to? The info you gave is not much to go on.HD's dont crap out easily (with exceptions) so give a bit more details and ill try to help you out.

I use 'Diskeeper' and it shows up in the code/legend as per title of topic after defragging.

No idea Dave,I don't use Diskeeper and the info you gave still isnt much to go with, that aside might i suggest you to use O&O Defrag. It works far better.