Question : Vista - maintain processes and prevent user shutdown

How can I keep Vista logged into to a particular user.  I need to run a certain process on end, but it seems like during the night somewhere, Vista shuts down the programs and logs of the user.  How can I prevent this?

Answer : Vista - maintain processes and prevent user shutdown

1) I assume you have check the screensaver and deactivated it?  (right click on the desktop screen and click on screen saveer and disable)
2) power scheme - check the power scheme  in the control panel and see what happens after so mane minutes (log off, siwxtch off screen etc...

if this is  all ok then I suggest the PC is crashing and restarting - check the control panel/administrator tools/ and look at the event log to see why it shutdown