restart issue

Hello Guys,
recently my pc get rebooting it self,
can you please give me few typs where i have to check or why?
Note: just upgrade my system to Windows Ultimate 64 Bit, system is just reinstalled, so no harware or virus,
please advice,
the log file is the next
Hello Guys
recently got the same issue with windows 7 Ultimate 64bit
i just formated my system and installed but the issue is still there
can you please advice,
- <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>41</EventID>   <Version>2</Version>   <Level>1</Level>   <Task>63</Task>   <Opcode>0</Opcode>   <Keywords>0x8000000000000002</Keywords>   <TimeCreated SystemTime="2010-01-31T16:42:17.948800000Z" />   <EventRecordID>965</EventRecordID>   <Correlation />   <Execution ProcessID="4" ThreadID="8" />   <Channel>System</Channel>   <Computer>User-PC</Computer>   <Security UserID="S-1-5-18" />   </System>
- <EventData>
  <Data Name="BugcheckCode">0</Data>   <Data Name="BugcheckParameter1">0x0</Data>   <Data Name="BugcheckParameter2">0x0</Data>   <Data Name="BugcheckParameter3">0x0</Data>   <Data Name="BugcheckParameter4">0x0</Data>   <Data Name="SleepInProgress">false</Data>   <Data Name="PowerButtonTimestamp">0</Data>   </EventData>
  </Event>
Answer #1
try doing a diagnostics test when you boot up try pressing
f8 to boot into a more advanced options mode ( i believe its f8 in windows 7 ) and go to diagnostics and let us know how that goes for now
also what are your pc specs?
Answer #2
ensure you meet the minimum hardware requirements, also check if updated drivers are installed. Check for conflicts in device manager in safe mode as well.
Answer #3
done
diagnostice has been done no issue found
my pc is Amd Athon64 2dual core5600 2.80
4GB
NVidia 9900 GTI
Ultimate 64 bit
never had this issue before
Answer #4
When does it reboot it self? When it starts up or when you’ve been using it for a wihe?
Answer #5
You mean it doesn’t start only or it restarts sometime after when you have started it??
Answer #6
its restart it self,
sometimes 10 min, sometimes 2 min, it depend,
when it goes off it restart it self and again it log in,
after doing check desk, i got the next in the log file
i thought CPU getting warm but its not unfortunatly

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-LoadPerf" Guid="{122EE297-BB47-41AE-B265-1CA8D1886D40}" /> <EventID>3012</EventID> <Version>0</Version> <Level>2</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2010-02-01T19:10:38.826400000Z" /> <EventRecordID>1373</EventRecordID> <Correlation /> <Execution ProcessID="1872" ThreadID="1304" /> <Channel>Application</Channel> <Computer>User-PC</Computer> <Security UserID="S-1-5-18" /> </System>
- <UserData>
- <EventXML xmlns:auto-ns2="http://schemas.microsoft.com/win/2004/08/events" xmlns="LoadPerf">
<param1>Performance</param1> <binaryDataSize>16</binaryDataSize> <binaryData>37070000000000000000000009030000</binaryData> </EventXML>
</UserData>
</Event>
Answer #7
maybe it reboot itself because you encounter a blue screen of death
In the early microsoft OS (since XP I think) they �Automatically Restart if the event of a bluescreen�
Try reactivate the BSOD by following those step :

-Right Click on �My Computer� and goto �Properties�. -Then goto the �Advanced� tab and under the headline �Startup and Recovery�, press the �Settings� button. -Untick the �Automatically Restart� box and press Ok.
Answer #8
maybe it reboot itself because you encounter a blue screen of death
In the early microsoft OS (since XP I think) they �Automatically Restart if the event of a bluescreen�
Try reactivate the BSOD by following those step :

-Right Click on �My Computer� and goto �Properties�. -Then goto the �Advanced� tab and under the headline �Startup and Recovery�, press the �Settings� button. -Untick the �Automatically Restart� box and press Ok.
thank you for the answer,
already done this,
but unfortunatly still rebooting from time to time
let say after i run chkdsk ultility it didnt rebooted for a while,
hope someone have explination for me