Some scripts / applications require certain scripts be run at a certain time to function properly. On Windows servers, you can set them up to run at certain times by creating a schedule task (which is similar to how you can run cron jobs on Linux servers).
You can set up Scheduled Tasks in Plesk by doing the following:
*The user you are logging in with should have enough permissions to create a scheduled task. Windows Shared customers automatically have permission, and the Admin user for Windows Dedicated Servers automatically have permission. Additional users created by the Admin on a Windows Dedicated Server may or may not have permission to setup scheduled tasks, depending on what permissions you give them.