How to stop computer being put to sleep ?

Question

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>

Answer 1

I may have found a way to stop the PC from automatically going to sleep mode.
FYI: Disabling the Hibernate/Hybrid Sleep function will also disable Fast Startup in Win8.
Hope this helps (I'm testing it on my own PC right now to see if the random sleep issue goes away.)
https://support.microsoft.com/kb/920730?wa=wsignin1.0
*edit*
Just realised this thread is FOUR years old and the problem is still happening :|