In order to completely remove the wallet from your computer, you shall find the folder where all the files are located. To do this, launch the wallet on your computer, click on the “HELP” section in the top menu, and select the “Debug window” tab.
In the window that opens, select the “Information” tab.
At the very bottom, click the “Open” button.
Now, to open the folder with the purse files, click the “Reveal” button.
Next, close the file window.
Then, in the dock, right-click on the ATB icon and select “Quit”.
Go to the level above and delete the folder “AtbCoin” with all the contents.
After that you can download and install a new wallet on your device.