Computer shutting off randomly

hi,

i dont know if this is the right place to post it, but it has been troubling me ever since i bought this shiny new computer.
every so often my pc just randomly shuts down, without a warning. it just shuts off and restarts itself and asks me if i want to boot in safe mode or normal mode.

now i have no idea why this is happening, but often it is during extensive use of my PC -> wow/internet/other games.

my pc spec:
windows 7 home premium
64bit version
intelcore i5 CPU
3.20 GHZ
4 gb ram
ATI radeon HD 4800

i have managed to find my logs and found this report which was logged at around the same time the PC was shut down.
if anyone here has some knowledge about these things, could you please help me solve my problem? so that i know what is causing this?
thanks in advance!

what does this mean?: LMS Service cannot connect to Intel(R) MEI driver

also, here is a strange log of a failure on my PC (it's dutch, sorry):

Logboeknaam: Application
Bron: Windows Error Reporting
Datum: 29-6-2010 22:13:23
Gebeurtenis-id:1001
Taakcategorie: Geen
Niveau: Informatie
Trefwoorden: Klassiek
Gebruiker: n.v.t.
Computer: Gebruiker-PC
Beschrijving:
Foutbucket , type 0
Naam van gebeurtenis: ScriptedDiagFailure
Antwoord: Niet beschikbaar
Id van CAB-bestand: 0

Handtekening van probleem:
P1: Microsoft Windows.NetworkDiagnostics.1.0
P2: Default
P3: 1.0.0.0
P4: Default
P5:
P6:
P7:
P8:
P9:
P10:

Bijgevoegde bestanden:
C:\Users\Gebruiker\AppData\Local\Temp\msdt\_0D698A95-A960-4238-965F-D50A6DBB794C_\Pkg281A.cab

Deze bestanden zijn mogelijk hier beschikbaar:
C:\Users\Gebruiker\AppData\Local\Microsoft\Windows\WER\ReportQueue\NonCritical_Microsoft Window_bd5996727e9ea1acda90841fa2c99a88df4fb9d6_cab_093528f4

Analysesymbool:
Opnieuw zoeken naar oplossing: 0nRapport-id: c4750c42-83ba-11df-9db5-40618679e065
Rapportstatus: 4
Gebeurtenis-XML:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Windows Error Reporting" />
<EventID Qualifiers="0">1001</EventID>
<Level>4</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2010-06-29T20:13:23.000000000Z" />
<EventRecordID>5018</EventRecordID>
<Channel>Application</Channel>
<Computer>Gebruiker-PC</Computer>
<Security />
</System>
<EventData>
<Data>
</Data>
<Data>0</Data>
<Data>ScriptedDiagFailure</Data>
<Data>Niet beschikbaar</Data>
<Data>0</Data>
<Data>Microsoft Windows.NetworkDiagnostics.1.0</Data>
<Data>Default</Data>
<Data>1.0.0.0</Data>
<Data>Default</Data>
<Data>
</Data>
<Data>
</Data>
<Data>
</Data>
<Data>
</Data>
<Data>
</Data>
<Data>
</Data>
<Data>
C:\Users\Gebruiker\AppData\Local\Temp\msdt\_0D698A95-A960-4238-965F-D50A6DBB794C_\Pkg281A.cab</Data>
<Data>C:\Users\Gebruiker\AppData\Local\Microsoft\Windows\WER\ReportQueue\NonCritical_Microsoft Window_bd5996727e9ea1acda90841fa2c99a88df4fb9d6_cab_093528f4</Data>
<Data>
</Data>
<Data>0</Data>
<Data>c4750c42-83ba-11df-9db5-40618679e065</Data>
<Data>4</Data>
</EventData>
</Event>