Windows 7: why dont i get any mini dumps?

I have been getting random freeze on computer where everything will just working and stay that way until i restart my computer. I tried to find my mini dump files on
C:/ system/ windows. i found it but it has little lock symbol next to folder and there is nothing in it...

by the way i get

event id 41
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="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="2010-03-09T12:16:59.122020400Z" />
<EventRecordID>48901</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Master-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>

i cant really tell "what" is making this happen... it never did this to me before! it started about 3 weeks ago and does not even get worse. its very constant on freezing... very annoying!

Thank you for reading!

If you have a realtek audio chipset look here for the solution. Iam having Microsoft-Windows-Kernel-Power crashes


Ken

i tried that i believe. went to
Realtek

and downloaded Windows 7 32/64 Auto Installation Program (SID:1354639)

...it didnt help...

its weird... inside device manager i have
High Definition Audio Device

and

Realtek High Definition Audio.

i can disable either one and sound still comes out...

bumping once more... did memtest with CD for about 5 pass and still no error... maybe its not RAM... so frustrating! help please

did reformat, and freeze is gone. nice =)