Troubleshooting Utilities/Freeware etc

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I want to get together some useful utlities, freeware, shareware etc that will allow me to troubleshoot on the go, in the workshop and pretty much any pc and platform. Want to start collecting Windows XP, Vista and 7 troubleshooting material first. Anything from HDD, RAM, CPU, Drives testers would help

Know of any good ones? anything that would make me a resourseful troubleshooting maniac!

 

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Programs you cant live without Thread

 

What about "wireshark"

Used to be called ethereal then they gave it a stupid name.

I owe many a warm dinner as opposed to a cold one or one in the bin/dog due to this program. I know it's not strictly P.C'ish but it's one to have

 

This.