I downloaded the PortableApp_Suite_Standard_1.0.exe and copied it onto a 2GB USB stick. Then I plugged the stick into a computer running Windows XP Home SP2 all up to date, and ran it. It ran through to at least 99% and then exited leaving behind a box listing 3666 7-Zip errors, each saying that it had failed to open a (different) new file.
It did manage to create the new folders Documents, Video, Music, and something else, plus the hidden Desktop.ini. So it can write to the root of the stick, where I told it to install, as advised.
There is plenty of room on the stick - at least 1.5GB.
This is not good. What do I do? I have tried again, and I have tried running from a command prompt, after checking that there are no hidden files taking up all the space. Same behavior.
If I can't get this going it will have to be back to Ubuntu, as Windows XP isn't ready for the desktop.....
[Moved to PortableApps.com Menu forum by moderator JTH]