|Open up the User Accounts window (type: nusrmgr.cpl as a Run command), go to "Change the way users log on or off," and uncheck "Use the Welcome Screen." That will set the login dialog screen to be default. If you're using the Welcome Screen and don't have a user account password, the Welcome Screen should be skipped. If you're using the login dialog screen, I think you'll still have to press OK.|
You don't need some cheesy tweak program.