how do i remove the encryption on an SD card. I do alot of google earth search stuff and transfer the waypoints but it encrypts the sd card and can't use it again with Humminbird PC. don't like having to use an SD card up everytime.

You are lost. The Encrypt folder is automatically written to an unlocked memory card.
It is done for the purchase and download of a Chart Select map==nothing else.
It used to have to be done manually but was changed to auto adding.
It has zero to do with what you are doing with waypoints and HumminbirdPC.
You can delete it, but it will be written to the card again when inserted in a Humminbird unit.
The file size is 193 bytes so it's not a memory hog.