@ptrblck Thank you so much. Problem solved. I uninstalled anaconda3 and re-installed the same anaconda3 x64, permission allowed to every user. But still had some other errors (https://github.com/conda/conda/issues/6053 52 & https://github.com/conda/conda/issues/6286 21) so I again uninstalled anaconda3 x64 and re-installed anaconda3 x32. This worked for me.