Hi Thalanayar, if you have indeed launched Etcher with Admin privileges, then that message is odd. For troubleshooting purposes, can you try downloading and running the Standalone version of Etcher, which can be downloaded via the Etcher website here: balenaEtcher - Flash OS images to SD cards & USB drives. (Click on the drop-down menu, and select “Etcher for Windows (x86|x64) (Portable)”.
Once it has finished downloading, double click to launch it. Try again to flash your image, and see if that works better for you. Thanks!