I have been unable to get Portable Apps to work more than once. I install it on a flash drive (3 different ones so far) and everything works fine until I eject it and plug it back in. Then I either get "The Portableappsplatform.exe is not a valid Portableapps program" or "the version of this file is not compatiable with the version of Windows you're running. Check to see if you need an x86(32-bit) or x64 (64-bit) version...
I was using this on several flash drives until the latest version of PortableApps was released. Now I can't install it and move to another computer and expect it to run without errors.
I have tried on Win7 and WinXP to no avail.