I'm not great at batch files either - but it seems like your using a timestamp in the name of the log file, then checking to see if the name exists when writing a log - time marches on and therefore, the log file name you created a minute ago using date time minutes, seconds, milliseconds? will never exist again. Try leaving out the timestamp in the name - the OS will tell you when it was created in the properties if that info matters.
Maybe I read your logic wrong - but the advice to go to Stackoverflow.com is solid. You will have to create an account, and the crowd there can be tough sometimes.
And shame on those who feel the need to knock a question that isn't in their wheelhouse and therefore need to scold - humor aside. You just asking a question in a place your comfortable doing so.
