Wiz has an emergency kit and so do I.
In fact, everyone should (along with disk images on external backups). My disk image saved my bacon very recently. If you’re the “go to” guy for tech stuff for your family and neighbors, this is a must.
You can add may other useful utilities to it from Nirsoft, and other places (which I encourage you all to add in your comments).
Here’s a great library of utilities and reviews to get you started: http://www.technibble.com/categories/computer-repair-tools/ . They used to have a kit of 50 tools, but discontinued it. You can browse, pick and choose.
Certainly consider ccleaner, Recuva, Process Explorer, Firefox Portable.
Have some fun putting your own kit together!
So this is what Emsisoft features:
The four utilities included free are:
I hope some good recommendations come along from the great folks here.
You can read about the download (you provide the flash memory unless you want to buy a “package”) here: http://www.emsisoft.com/en/software/eek/
and you can download it here: http://www.emsisoft.com/en/software/download/