Create a batch file to execute tasklist and append its output to log.txt

I’m trying to create a batch file to execute tasklist every 3 minutes and log it into log.txt.
I’m very new to batch files and would like to know where I’ve gone wrong in my batch file.

@echo off

set "CURRENT_DIR=C:Documents and SettingsAdministratorMy DocumentsDownloads"

Solution :