Constant Unexpected Shutdown Errors in Vista: HELP!

[mnemonicus]

Salutations:

I am having a strange problem with Vista. I installed a clean copy of Vista Home Premium, and I made sure that my system could handle it by using Vista Upgrade Advisor. Upon install, any time my system is doing a resource intensive task, like installing updates, installing new software, or burning a DVD, it simply shuts down.

This did not happen with XP. My hardware is functioning fine. My power supply is new. My internal case temperature is steady at 82 F, and the processor temp is steady at 93 F.

This is rendering Vista an unusable product, and I'm not sure what to do!

Below is information about the error I am repeatedly getting (about every 20 minutes, without fail).

Log Name: System
Source: EventLog
Date: 10/18/2007 4:17:02 PM
Event ID: 6008
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: OakTree
Description:
The previous system shutdown at 4:12:27 PM on 10/18/2007 was unexpected.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="EventLog" />
<EventID Qualifiers="32768">6008</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2007-10-18T20:17:02.000Z" />
<EventRecordID>3796</EventRecordID>
<Channel>System</Channel>
<Computer>OakTree</Computer>
<Security />
</System>
<EventData>
<Data>4:12:27 PM</Data>
<Data>10/18/2007</Data>
<Data>
</Data>
<Data>
</Data>
<Data>435</Data>
<Data>
</Data>
<Data>
</Data>
<Binary>D7070A000400120010000C001B00DE01D7070A000400120014000C001B00DE01600900003C000000010000006009000000000000B00400000100000000000000</Binary>
</EventData>
</Event>

HELP!!!​

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