http://www.readwriteweb.com/archives/a_computer_repair_utility_kit.php
Technibble, the Australian site for aspiring computer techies, recently released the second version of its popular Computer Repair Utility Kit, a collection of 57 hand picked tools to help you diagnose and repair your Windows machine.
Uses some portable apps.
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floating around at The Daily Cup of Tech blog. http://www.dailycupoftech.com/ I can't recall the name, but it was submitted in a contest they held.
Edit: I looked for it and it's called PCRepairSystem. It's a 14 m.b. download and has a lot of popular applications like S.I.W., Eraser, Ccleaner, Sequoia, tweakUI. License is unknown, so I'll let you decide.