Hi SuperFast,
so I got it right.
Ok, no problem about the help of Alan_B. As I said I'm absolutely sure my PC wasn't HOG or starved, instead it was completely blocked.
I'm not sure the issue was caused by Defraggler and this is why I asked those questions before. Probably it's my hard disk but I'm not sure too.
However I cannot see the 'health' tab of my hard sik from Defraggler main window, probably because that hard disk doesn't support some interfaces (i can see the 'health' tab from my internal hard disk).
The external hard disk I was defragmenting is 400 GB (on the box there is written PackardBell but I'm not sure this was the manufacturer of the hard disk). It was 82% used. The files it has have a different size, large small etc.
CPU: AMD Athlon 64 X2 6000+ (i think two core)
RAM: 4GB Single channel DDR2 # 334MHz
MB: ASUSTek M4A79 Deluxe.
I don't know how much ram was free and how much was used at the time of blocking, however I don't think too much used.
After reastarted my PC I ran again Defraggler and all was fine, no problem and the hd had a good defragmenting.
I said I was a developer just to let you know I'm accustomed to the "first line" of attempt in those case.
I've been using Piriform products for many years or so.
Anyway, with Speecy I can create a snapshot of my hardware if you need to.
Thank you,