Aken,
You need to open Control Panel and go to Scheduled Tasks. Click Add Scheduled Task. Click the Next button and in the following dialog, click Browse. Navigate to C:\Windows\System32\Logoff.exe. And click Open. In the next dialog, choose the option that you want, for how often the task runs. In your case, choose Daily and click the Next button. Set the Start time that you desire and set the Start Date. You can also tell it only to run on weekdays or every day. Then click Next. Now, you need to enter a username and password of an Administrator level account, so that the task can execute. The account used must have a password. Click Next, then click Finish.
Note: There is a registry modification that allows the use of blank passwords for scheduled tasks, but it also allows the use of blank passwords for a number of other things, including network access, running programs and the like. It can create a majority security hole in your system. I DO NOT recommend using it.