this is basic windows.
look under CONTROL PANEL -> POWER OPTIONS.
under the POWER SCHEMES tab, you should see "Settings for Home/Office Desk power scheme"... well at least for my dell desktop it does.
it has 4 pull down thingees:
Turn off monitor:
Turn off hard disks:
for a web server, set the monitor to turn off fast, like 5 minutes. for the HD, set it for a long time or NEVER.
for standyby and hibernate, it should be set to NEVER. that is where your machine gets its info from...