Hi,
When you run in parallel, the only restriction is the platform, not the OS version. This means that you can run only in Windows or only in Linux (or any other compatible platform). You cannot distribute a computation across PCs that some are linux and some Windows.
This of course has to do with the platform telemac was compiled on. You compiled in Windows, you run in Windows. The Windows version doesn't make any difference, because the actual execution is carried out by the mpich2 engine, which has to be installed on every computer that you want to use. So check the mpich2 compatibility list to see whether your Windows version is compatible. My guess if that all Windows version from XP and up are compatible.
Try to install a version of telemac following the guides on the site and then come back with specific problems, so that you can get help on this forum.
I hope it helps.
Costas