Just downloaded CCleaner and Defraggler on the recommendation of Kim Komando.
Just a quick question... I haven't degragged my hard drvie since I have had the computer (about 3-1/2 years) and Defraggler says it will take about a day. Is it still okay to use the computer, or should I leave it totally alone so it can do its work?
In my experience, trying to use a PC while the HDD is being defragged, can be aggravatingly slow. I usually run a defrag when I know I will be away from the PC, or let it run overnight if it has been a long time since my last defrag.
That's why letting the defrag run overnight works best (for me)
I think defragmenting while not using the computer is the best practice for a more thorough non-user uninterrupted defrag (of course keeping in mind that there's other stuff that will take place in the background that may slightly interfere but of course with no real concern such as antivirus programs auto-updating, etc.)
with the filename column ticked, only those files checked are defragged.
without those ticked, clicking Defrag from the Drive tab will do your entire hard drive.
my personal method for even quicker defragging is to Analyse, then on the File List tab, click the Size column to sort in descending size order, then select the first 10, 20, 100 (whatever suits your needs) and click Defrag Highlighted.
I then repeat that process for the Fragments column.
that way I only defrag the worst offenders; the biggest fragmented files and those with the most fragments.