Oblivion system restart help needed

[Bloodfyres]

Ok well i bought oblivion for the pc yesterday as it is a game i have wanted on pc for a while now, and i only recently got a pc with the capabilities to do it, or atleast i thought. Basically about 10-15 seconds into the game, my pc just restarts itself. i had this problem on one of my very old pcs but that was because it wasnt up to the games specs. before i continue ill give you oblivions recommended specs and my specs.

Oblivion Recommended specs;
3 Ghz intel pentium or equivelent processor
1gb RAM
ATI x800 series, NVIDIA GeForce 6800 series, or higher Graphics card

Now my system (i got this off of the Oblivion diagnostics tool)
perating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.090206-1233)
Language: English (Regional Setting: English)
System Manufacturer: .
System Model: .
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Pentium(R) Dual CPU E2220 @ 2.40GHz (2 CPUs)
Memory: 3326MB RAM
Page File: 395MB used, 4814MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Card name: NVIDIA GeForce 9500 GT
Manufacturer: NVIDIA
Chip type: GeForce 9500 GT
DAC type: Integrated RAMDAC
Display Memory: 1024.0 MB

I am not very good with computers so most of this means nothing to me, but maybe it does to some of you.
I have tried running oblivion on low, medium, and high graphics settings and none of these work.
I have only had one anomoly to the restarting and that is when the whole screen turned green and i had to turn off the computer because the restart didnt work.
It plays other games like Empire total war on full Ultra setting graphics and anti aliasing perfectly fine
I dont know what else i can say
Any suggestions on what i can do? thank you for your time
p.s. Try not to be too technical

EDIT:
i ran the can you run it test for recommended aswell and this is what i got;
CPU
Recommended: Pentium 4 or Athlon XP or better
You Have: Intel(R) Pentium(R) Dual CPU E2220 @ 2.40GHz
PASS

CPU Speed
Recommended: 3 GHz
You Have: 2.40 GHz Performance Rated at: 3.6 GHz
PASS

RAM
Recommended: 1 GB
You Have: 3.2 GB
PASS

OS
Recommended: Windows 2000/XP/XP 64-bit
You Have: Microsoft Windows XP Professional (Build Service Pack 22600)
PASS

Video Card
Recommended: 128MB Direct3D compatible video card (NVIDIA GeForce 6800+ / ATI Radeon X800+)
You Have: GeForce 9500 GT
PASS
Features: Recommended attributes of your Video Card
Required You Have
Video RAM 128 MB 1.0 GB
3D Yes Yes
Hardware T&L Yes Yes
Pixel Shader version 2.0 3.0
Vertex Shader version 2.0 3.0


DirectX version
Recommended: DirectX 9.0c (included on disk)
You Have: 9.0c
PASS

Sound Card
Recommended: Yes
You Have: Realtek High Definition Audio
PASS

Free Disk Space
Recommended: 4.6 GB
You Have: 164.4 GB
PASS

DVD-ROM
Recommended: 8X DVD-Rom
You Have: YC4771Q LMO333D SCSI CdRom Device
PASS

 

[Ritwik7]

What are your system temperatures (CPU / GPU) under load? Check if any of your components are overheating.
Ensure you have the latest drivers for your gfx card installed.

How many RAM sticks do you have installed? Try swapping and running them one at a time. Also tell us what PSU you are using.

 

[Bloodfyres]

i ran a coretemp check and got this (note i have no idea what it means)
(another note, ant post image yet so this is the rough layout)

CPU #0: Temperature Readings[/U
Low High Load
TJ. Max: 85 degrees C
Core #0: 30 degrees C 30 Degrees C 33 Degrees C 2-5 %
Core #1: 30 Degrees C 30 Degrees C 34 Degrees C 0-5%

The 2nd and third numbers along are low and high and the percent at the end is the load

and how do i check any of the other things?
sorry im very new to this, iv never really payed this sort of attention to computers before

 

[ThrasherFan22]

To check your PSU, just look on the back of your PC or pop it open. The PSU is the power supply so if your hardware requires more power than your PC is generating, they wont work.

To download the latest drivers, go to the NVIDIA website.

 

[Bloodfyres]

Is it the Ac/220V thing? and i cant open my pc because of the guarentee sticker thingy i think.
i cant see oblivion taking more power on minimul settings than empire total war on max settings (including ultra ultra size mod)

 

[Ritwik7]

You have problems only while running Oblivion?

It would be better if you use this program to monitor temps.

And we want your PSU manufacturer and Wattage rating.

 

[Bloodfyres]

is that program
but bear in mind unusually my oc has been running all day as i have been doing work, whilst usually i use it about an hour or 2 so it may be hotter now i dunno.
and i just on list of stuff in my pc and this is the standard;
# 1 x Standard Case Fan
# Intel Pentium D 5.6Ghz (2.8Ghzx2) Dual Core CPU
# nVidia 9500GT 1GB PCI Express Graphics Card
# 4GB (4 x 1GB) Crucial PC5300 667MHz DDR2 Ram
# 320GB 7200rpm SATA II Hard Drive
# 22x Dual Layer DVD +/- Rewriter
# Integrated 5.1 Channel Audio
# Standard 450W PSU
although iv had 2 extra fans put in and internet port thingy on the back
and extra usb slots
also note that those were the base orders, the ones at the top of the post are whats in now, i dont know whats changed, i let my next door sort that out for me.

 

[Bloodfyres]

just managed to get it to work long enough to do the tutorial for once, after literally about 20 restarts, and i dont know why it worked but it did. could it be to do with the fact that iv ran my pc for an unuasually long time for once and the game only works when its warmed up or something. ill keep this updated tomorrow after school when i get back and try it again. anyway im turing in for the night.
also all my tempurature things have changed since i ran it to this....

so it seems most of the maxs went up
could someone please explain that aswell?
thanks