Windows 7 Ultimate Automatically Restarts/Reboots.

I have installed Windows 7 Ultimate-64 bit on my comp for 2 months now. Before,
everything worked fine but for the past couple of weeks something weird is happening. My
computer restarts automatically for no apparent reason or suddenly goes to rude standby.
There is no specific time or software that I can relate this problem to. Sometimes when
just being idle or running the anitivirus, it reboots or sometime just surfing the net
causes the comp to restart. The system may work for 1 hour without problem or at times
within 15 minutes it can reboot.
The system was working perfectly previously, it started to occur from April 2010 even
though mine is full version original Windows7 Ultimate edition(Version 6.1.7600 Build 7600).
 I don't understand what the problem is.
I see the following Critical Error message in logs:

The system has rebooted without cleanly shutting down first. This error could be caused

if the system stopped responding, crashed, or lost power unexpectedly.

<Event xmlns="">
- <System>
  <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-

77220C37D6B4}" />
  <TimeCreated SystemTime="2010-04-19T12:16:41.236015300Z" />
  <Correlation />
  <Execution ProcessID="4" ThreadID="8" />
  <Security UserID="S-1-5-18" />
- <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>

I have tried the following:
(a). Remove the tick on "automatically restart" -->Nothing; I don't get BSOD
(b). Changing the system date to past --> Nothing
(c). Did memory check --> Nothing
(d). Tried in Safe mode with Network -->Nothing
(e). update drivers, with device manager --> Did not do this as how can this be a
problem when the system was working flawlessly just one month back.

System Details:
Processor:      Pentium(R) Dual-Core  CPU      E5200  @ 2.50GHz, 2500 Mhz, 2 Core(s), 2
Logical Processor(s)      
BIOS Version/Date:      Phoenix Technologies, LTD 6.00 PG, 3/30/2009      
SMBIOS Version      2.5      

Please help me with this,  I'm really tired resolving this issue. Need all of your help.
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When you did your memory test, what did you use to test it?

Remember that drivers can become corrupt, so don't dismiss this just because it worked before.

You might want to get the power supply checked.  It's possible a capacitor on one of the rails may have an intermittent problem, especially if you are not getting any blue screen warning.

naveenuAuthor Commented:
windows7 has one memory test feature which i tried. But it did not say any problem.
Also do you know how to update my drivers? Is there any one-stop shop to do this?
Download Memtest from here: .  This will give your memory a very thorough test and provide you with a report of the test.  By the way, its freeware.

I'm not aware of a "one stop shop" for drivers unfortunately.  However, Windows 7 is better at seeking them out than their predecessors, so it won't be quite the chore it was.

Let us know how you get on.

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naveenuAuthor Commented:
Did the memory test, it did not say any problem, it passed successfully & even drivers are up to date.
I called up MS tech support, he disabled some 3rd party services & did clean boot etc from MSCONFIG.
Now the problem (either crashed standby/ or auto restart)occurs after running for 2.30 hours.
But still the problem is there.
naveenuAuthor Commented:
I see a definite time of this happening now, it happens after running for 2.30 hours.
Any clue for this conundrum.
naveenuAuthor Commented:
Hey, got the issue resolved. The problem was in the Mercury motherboard, it was getting some  circuitry problem. Once it was replaced Windows7 has been working fine. Thanks for all your support.

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I too resolved this problem. Unfortunately you resolved this problem using a slightly more expensive method. I don't blame you though and I'm just posting this to help someone else who might be experiencing this proble (not to rub it in). The problem is a driver. What driver exactly, I don't know. I used a driver management software to scan my computer and found "23 drivers in 6 driver packages" needing upgrade. Once I did the driver upgrade the problem was resolved. I'm putting my money on the Chipset Driver but not 100%. Hope this helps the next person.
naveenuAuthor Commented:
 My vendor told it was a hardware problem & you are saying its software. Can you elaborate how you resolved your issue? Also which driver management software you used to scan your computer?
When I ran the windows driver scan everything was compatible.
How can the driver worked properly for two months & suddenly became incompatible? Did windows update do something?
Ekitech - what driver management software did you use? I am having this problem, I have tried numerous things and all have failed.
OK so my computer was working fine for a long time then all os a sudden it started crashing every week or every couple of weeks. I looked in the event viewer and would always find that the problem was NTOSKRNL.EXE but that doesn't really tell me anything. I did a little reasearch and found out that when the computer crashes it creates a log file and that i needed to download a special tool to read it. The tool is called Debugging Tools For Windows (x64). I opened the log files that were generated from the crashes and found that the problem was something called a Vista Driver Fault so from there I read in other places on the net that indeed it is a driver issue so I got a program called Driver Genius Pro. It detected that 6 driver groups (Nic, Graphics, Chipset, Audio, Mouse, and something else) and 23 actual drivers needed updating. The program downloads and installes the drivers. Now I haven't really had enough time to confirm that this is the solution because it's only been about two weeks since I updated all the drivers but I'm really suspicious that the problem mentioned in the log was a "Vista Driver Fault" while I'm running Windows 7 64Bit. I'm hopeful this has solved my problem.

Hope this helps!
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