PC Reboots when accessed remotely

Using Vista Business.
When I login to this pc through Remote Desktop Connection after a few
minutes the connection is interrupted because the pc has rebooted. This
seems to only happen in this case. You'll find the error below. I'm not sure
if this is a video driver or network card issue, but I'd appreciate some
help as to what it could be.

Log Name: System
Source: EventLog
Date: 12/10/2007 5:39:53 PM
Event ID: 6008
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: PC33.ASM.local
Description:
The previous system shutdown at 5:38:10 PM on 12/10/2007 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="2007-12-10T22:39:53.000Z" />
<EventRecordID>9049</EventRecordID>
<Channel>System</Channel>
<Computer>PC33.ASM.local</Computer>
<Security />
</System>
<EventData>
<Data>5:38:10 PM</Data>
<Data>12/10/2007</Data>
<Data>
</Data>
<Data>
</Data>
<Data>1743</Data>
<Data>
</Data>
<Data>
</Data>
<Binary>D7070C0001000A00110026000A004700D7070C0001 000A00160026000A004700600900003C000000010000006009 000000000000B00400000100000000000000</Binary>
</EventData>
</Event>