Windows 7 shuts down nightly

[ceasefire]

I recently purchased this computer and it has been shutting down completely every night. I have to physically turn it on and it performs a complete new startup each time. I have been through all the power settings and everything is set for never shutdown as far as I can see. I thought it was a setting in my Avast as it shuts down at 2:22am and my Avast starts its complete scan at 2:00 but I changed that setting too. I am pasting my event log that is the Kernel Power initiated shut down.
- <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>109</EventID>
<Version>0</Version>
<Level>4</Level>
<Task>103</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000004</Keywords>
<TimeCreated SystemTime="2011-10-06T09:22:02.879382300Z" />
<EventRecordID>14328</EventRecordID>
<Correlation />
<Execution ProcessID="600" ThreadID="604" />
<Channel>System</Channel>
<Computer>Owner-HP</Computer>
<Security />
</System>
- <EventData>
<Data Name="ShutdownActionType">4</Data>
<Data Name="ShutdownEventCode">0</Data>
<Data Name="ShutdownReason">0</Data>
</EventData>
</Event>

[vive]

Have you checked in
Task Scheduler
Power Management