If anaconda-navigator.exe file is in this folder -> restart your system -> Open terminal -> anaconda-navigator
If anaconda-navigator.exe file is NOT in this folder -> Unistall Anaconda and reinstall it
Remove all Anaconda-related files and directories
Open Terminal (by pressing Ctrl+Alt+T)
Type following command in Terminal and press Enter
conda install anaconda-clean
anaconda-clean --yes
rm -rf ~/anaconda3