Dear Andreas, Thanks for a quick response. Our techie tried precompiled versions also (at least that is what he told me). As far as I understand, the precompiled versions are for 32 bit systems and everything that is supposed to run on a 64 bit system has to built form scratch. I've seen instructions at http://gretl.sourceforge.net/win32/gretl_network.html also and send a reference to our IT guy. Unfortunately it didn't help. Best regards, Jonas