The models Planet Simulator, PUMA and the postprocessor Pumaburner can be compiled and run with Windows if you have a FORTRAN-90 and a C++ compiler installed (e.g. GNU FORTRAN and GNU C++). The GUI (Graphical User Interface) and MoSt (Model Starter) are written using the Xlib (X11) library and cannot run with native Windows. There are following solutions: 1) Install a X11 emulator (e.g. the free Cygwin X11). I've heard from users, that they got it to work with the models. 2) Install a Linux in a virtual machine like "Parallels" or "VMware". Then use the virtual machine for running the models. 3) Install Linux (e.g. OpenSUSE 11.2) on your Windows-Computer. It can coexist with Windows and installs a boot manager, that enables switching between Linux and Windows at boot time. Solution 3 is the cheapest (for free) and fastest solution. Please don't ask Windows related questions via email, we don't support Windows! But you may open a thread on our forum http://www.mi.uni-hamburg.de/Forum.5807.0.html if you want to discuss with other Windows users. If there is a skilled Windows-programmer, who successfully programs a Windows-GUI for our models, I'll include that version in fortcoming releases too. Edilbert