Computer Diagnostics

I am interested in computer diagnostics hardware and software such that I can plug in a diagnostics computer into the USB port of another computer to fine tune and check for viruses etc. Does a system like this exists that can issue a report and if not, is there a good website that has articles on the best practices for doing computer diagnostics? I know that there are some computer diagnostics built into the application software and some diagnostics are best done by third party hardware and software. Please advise.
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Pradeep DubeyConnect With a Mentor ConsultantCommented:
nobusConnect With a Mentor Commented:
i use the UBCD a lot for diagnostics :            

for hardware items, i suggest to look here :

the general site is
do you need more Big Al?
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