Tried on XP, w7 and now also on w2k (just to see what it does) and did so far not manage to launch 3.4.3
it crashes on loading some of the extensions bundled extensions, either nonlinear math or some others.
It crashes also apparently on file soffice.bin.exe
Tried clean install, same effect, xp, w7 are not able to launch it at all.
Furthermore, when attempting to launch it from the next computer, I am getting a message saying that other users are running this copy already. As user is indicated the name of the computer where the stick was inserted as last.
3.3.x versions run fine on all computers.