ErrMsg Tells You What That Windows Error Code Really Means

[Detale]

ATM I don't have any error codes but this seems like a good utility to have in the cabinet

http://lifehacker.com/5532682/

[Expeto]

if someone makes a mobile version of this, it would be bloody useful

[Appzalien]

Odds are you can make your own. I don't know how many times my programs that were installed to the D drive still ran after I formated and reinstalled C (no more registry entries or shortcuts).
Install to your PC and then just copy the directory to another PC or usb and give it a try, just double click the proper start exe and if it runs its portable. You can also test by installing, copying the directory to another location, and then uninstalling to see if the copy will run. This is not necessarily the best way though, since alot of uninstallers leave registry entries and stuff behind.