Hello, I am trying to use MPICH2.1.4.1.p1 with Lakes Environmental AERMOD View. I used this feature many times with different computers and had no problems. However I recently bought a new computer (Dell Inspiron 7577 i7-7700HQ with SSD) and did a clean Win 10 installation (v1803). I have also installed .net framework 3.5 from Settings-> Programs and Features -> Turn Windows Features On. In my first try I got this error Unknown option -d Error while connecting to host, No connection could be made because the target machine actively refused it (10061) Connect on sock (host=R2D2, port=8676) failed, exhaused all end points Unable to connect to 'R2D2:8676', sock error: Error = -1 Readfile() failed, error 109 unable to start the local smpd manager Then I installed mpich2 from command prompt by "msiexec /I %path%". This time I got another error: Unable to open the HKEY_LOCAL_MACHINE\SOFTFWARE\MPICH\SMPD\Process\2776 registry key, error 5, Access is denied. This has various similar errors with different registry keys. 3240, 6304, 11892, 8504, 12536, 9664, 3104. Numbers change with each try. I have also tried various different things. Adding bin folder to system path, giving full access to smpd from registry, different win 10 versions (education, pro - old and recent updates), disabling firewall, running as administrator. When I gave reg access and run as admin, errors stopped but Aermod didn't run. So giving full access doesn't solve my problem. If you have any suggestions for this problem, I would like to try. I need to mention my computer knowledge is only end-user level so I am not familiar with technical terms. Thanks, Tolga _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss