That is just a command provided for your use by Windows; it tells your computer to shut down in 3 minutes. There is no need to "repair" anything as no damage has been done. Simply do not issue that shut down command and it will not shut down. If you have saved it as a batch file and set it as a scheduled task, simply delete the file/task. That's all there is to it.
Hope this helps,
i made the virus:shutdow -s -t 180 -c "end of pc" and i forget how do ripaer this!HELP!