LR 3.2 randomly restarts my computer

Question

     Hello!
     Let me say first: I'm a long time reader of this forum and I'm aware of Lightroom 3 performance issues for some users and so on. I didn't have those luckily and I was enjoying LR 3 with good performance. Until now.
     I'm preparing for purchasing Lightroom 3 (I bought Martin Evening's LR3 book and I'm enjoying reading it) but I've encountered a very serious issue after I upgraded to LR 3.2 (this didn't happen to me in 3.0). When I'm working in LR 3.2 (no batch operations, only modifying some sliders for example) the computer randomly restarts. It just reboots. No BSOD, no dump file. Only the error log in Adm. Events which I'll post here. This is only happening when I'm working in LR 3.2. And it's making me really nervous. I don't have a clue why.
      So I've started testing again the PC for hardware problems. FFT-z is running rock solid for 8 hours, temperatures are ok, memory diagnostics are ok. Still nothing.
     I'm thinking now that this could be caused by recent software changes introduced in LR 3.2 to improve performance in some cases. My sistem is Win 7 Prof x64, 6 GB RAM, Core i7 930, Radeon 5770.  I'm posting below the error log.
     I would really like some help since this is a devastating issue to me. Thank you.
Log Name:      System
Source:        Microsoft-Windows-Kernel-Power
Date:          5.09.2010 2:15:18 AM
Event ID:      41
Task Category: (63)
Level:         Critical
Keywords:      (2)
User:          SYSTEM
Computer:      Cristian-PC
Description:
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 Xml:
<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="2010-09-04T23:15:18.024008000Z" />
    <EventRecordID>61607</EventRecordID>
    <Correlation />
    <Execution ProcessID="4" ThreadID="8" />
    <Channel>System</Channel>
    <Computer>Cristian-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

unexpected, random reboots are usually provoked by bad drivers or faulty hardware but not single applications.
Just a couple of articles I found googleing for Microsoft-Windows-Kernel-Power: EventID TechnetForum MSSupport
I would start to verify that all device drivers are up-to-date, especially LAN or WLAN cards and see if this resolves your issue.