WinXP Hang on Idling

If you have a WinXP System hang after idling for a short time or sometimes...
these are the solution to check out:

"Do you have / use a screensaver or have you set some power saving option in Control Panel's Power Options. Like turning off the hard disk after xxx amount of idle time?
Go to Control Panel >>Appearance and Themes >> next select Display >> look at Screen Saver tab.

Is it set to power off the hard drive after xx amount of idle time ?
Control Panel >> Performance and Maintenance >> Power Options.

Right-Click the My Computer icon on desktop. Select Properties.
Next, select Advanced. Look for a block that says Startup and recovery. Press the settings button.
In System failure section, turn off (un-check) Automatically restart. Apply change."

Happy learning and trying... kindly post your question if any.