Windows XP Home Shuts Down

My System:
Athlon xp 1800+
512 Meg Ram
WD 80 Gig HD
Gigabyte GA-7VAXP motherboard
Nvidia Geforce 3 Ti200 Video card
Creative SB Audigy 2 ZS sound card
Norton Internet Secutity 2004(firewall and AV software)

Here is my problem:
My system shuts down quite frequently, though there seems to be no reason
as to when or why. It could run for 5 min or an hour sometimes if I'm lucky
a couple of hours. I have not been able to attribute this to running any
specific program. When it shuts down it reboots, no other options, I did
disable the auto restart and now get the blue screen before having to do
a manual reboot. The blue sceen is pretty vague, though I do get this,
Stop:0x0000008E (0xc00000005, 0x6c59746f, 0xf3cc260c, 0x00000000) the numbers
in parenthasis do change but the 0x0000008E is always there. Sometimes it
struggles to reboot, it might take 3 or 4 times before I can get back to my
desktop. If the boot fails, I get the blue screen as descibed above
and have to manualy reboot. One time I did get this "Bad EX_handle" but usally
I just get the stop:0x0000008E.  I will also paste the event system and
application errors at the bottom of this message.

What I've done thus far:
1.Checked driver, have updated drivers from manufactures
2.Updated virus definition, no viruses found
3.Reinstalled windows(repair)
4.Reformatted and reinstalled windows
5.I've downloaded and run spybot search and destroy software
6.Downloaded Microsofts memory testing software, all tests were normal
7.Replaced power supply with Antec 350 watt power supply
8.Reseated every piece of hardware on the motherboard
9.Checked for heat problems, cpu is normal temp and fans are running
10.Beat my head on the computer desk several times(out of frustration, didn't help)

I've been to differnt forum on troubleshooting xp and thus far no one has
been able to help. So thats it in a nutshell, I hope I provided enough info,
if not let me know what else you may need.

Thanks, Wes

Event errors:

Event Type:      Error
Event Source:      EventSystem
Event Category:      (50)
Event ID:      4609
Date:            11/2/2003
Time:            12:03:56 PM
User:            N/A
Computer:      LEVIS
Description:
The COM+ Event System detected a bad return code during its internal processing.
HRESULT was 8007041F from line 44 of d:\nt\com\com1x\src\events\tier1\eventsystemobj.cpp.

Event Type:      Warning
Event Source:      EventSystem
Event Category:      (54)
Event ID:      4353
Date:            11/2/2003
Time:            11:52:20 AM
User:            N/A
Computer:      LEVIS
Description:
The COM+ Event System attempted to fire the EventObjectChange::ChangedSubscription event
but received a bad return code.  HRESULT was 80040201.

Event Type:      Warning
Event Source:      EventSystem
Event Category:      (52)
Event ID:      4356
Date:            11/2/2003
Time:            11:52:20 AM
User:            N/A
Computer:      LEVIS
Description:
The COM+ Event System failed to create an instance of the subscriber
partition:{41E90F3E-56C1-4633-81C3-6E8BAC8BDD70}!new:{D3938AB0-5B9D-11D1-8DD2-00AA004ABD5E}.  
CoGetObject returned HRESULT 8007041F.



Event Type:      Error
Event Source:      VSS
Event Category:      None
Event ID:      8193
Date:            11/2/2003
Time:            11:49:17 AM
User:            N/A
Computer:      LEVIS
Description:
Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance.  
hr = 0x80040206
Data:
0000: 57 52 54 57 52 54 49 43   WRTWRTIC
0008: 32 31 31 33 00 00 00 00   2113....
0010: 57 52 54 57 52 54 49 43   WRTWRTIC
0018: 32 30 37 38 00 00 00 00   2078....

Event Type:      Error
Event Source:      DCOM
Event Category:      None
Event ID:      10005
Date:            11/2/2003
Time:            12:03:56 PM
User:            LEVIS\Wesley Levis
Computer:      LEVIS
Description:
DCOM got error "The service database is locked. " attempting to start the
service EventSystem with arguments "" in order to run the server:
{1BE1F766-5536-11D1-B726-00C04FB926AF}