My bro's year old Acer laptop was given to me the other day to 'service'
Windows Vista Defrag set to run weekly at 7pm on Sundays. lol It looked like it had never been touched!
Installed Degraggler and ran it, it took 4 hours! When it had finished it had done a really good job.
Can you see what windows defragger has done? No.
Try it, install defraggler (or any other defrag proggie for that matter) and see what it looks like. If your interested that is.