Thanks - the command line doesn't give any output (am I supposed to replace the ... with something? Apologies if I'm being stupid) , but I've run the GUI and pointed it to Perl. It's showing a number of DLLs that it can't find, mainly API-MS-WIN-.* , but also DCOMP.DLL, GPSVC.DLL and IESHIMS.DLL - is this a concern?