If your company’s group policy has necessitated “system in-activity auto lock”, and you need to do otherwise, caffeine will keep it awake.
The application is having a very small footprint, and works by simulating a key-press once every 59 seconds. So, your diligent machine thinks that you're still working at the keyboard. Hence, no locking the screen!
Just download and add the executable to the (Windows 7 –> Start Menu –> All Programs –> StartUp). You are done!
Get it now (caffeine.zip (14k)), and thank me later!