I have two brand new windows 7 PCs being used for Point of Sale. They keep locking after short periods of inactivity. I have changed everything I know to change.
In the power options: The PCs are set to never go to sleep, the displays are set to never turn off, require a password on wakeup is set to Don't require a password, and hibernation is disabled.
The screensaver is set to None and the On resume, display logon screen is unchecked.