So the computer is going on four years old now and it's probably about time it will start acting up or worse, show signs of getting ready to die.
I run anit-virus, anti-sypware and clean-up programs along with defragging the HDD
I've gone to Major Geeks to see what is there and if they had recommended choices. I found the following:
Find out what is inside my computer: Everest Free Edition
AIDA32
PC Wizard
SIW (System Info)
WinAudit
SIV (System Information Viewer)
Belarc Advisor
Process Explorer
WinAudit
I'm sure this list is not all the programs that are out there or that they all perform diagnostics.
So the questions are "What do you use for diagnostics of your system?" and "Will any of the programs out there help you catch a problem before your system goes belly up?".