In Windows 7 Pro I would like to stop the computer putting itself to sleep. It does so even though the time to sleep has been set to 'never' and when all four cores are working at 100 %. I am not concerned about energy efficiency, I would like the machine to run my software without interruption. Log is below : Log Name: System Source: Microsoft-Windows-Kernel-Power Date: 28/10/2011 02:48:30 Event ID: 42 Task Category: (64) Level: Information Keywords: (4) User: N/A Computer: Pelargonium Description: The system is entering sleep. Sleep Reason: System Idle Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" /> <EventID>42</EventID> <Version>2</Version> <Level>4</Level> <Task>64</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000004</Keywords> <TimeCreated SystemTime="2011-10-28T01:48:30.836385700Z" /> <EventRecordID>27285</EventRecordID> <Correlation /> <Execution ProcessID="4" ThreadID="64" /> <Channel>System</Channel> <Computer>Pelargonium</Computer> <Security /> </System> <EventData> <Data Name="TargetState">5</Data> <Data Name="EffectiveState">5</Data> <Data Name="Reason">7</Data> <Data Name="Flags">0</Data> </EventData> </Event>

I think I found the answer on MS's 'Sleep and hibernation: frequently asked questions'. The machine has to be stopped from 'hibernating' as well as from 'sleeping'. It is necessary to go beyond the user friendly dialogues and dig in to the menus to find this.

Care to elaborate on "dig into the menus to find this?"