My computer in rebooting without warning

Hello
I hope someone can help me with this problem. My coputer reboots without warning sometimes, often when i surf the Internet and listen to music (på otherwise as well)
When Windows restarts it tries to solve the problem and i get this window that I attached.
I have visited Realtek's website and downloaded som drivers but the problem remains the same. Does anyone regognize this problem? What can I do?

I'll be very thankfull for your help
//Teodor

Has your computer always done this?
Do you use the adaptor? If not turn it off in the bios and the problem will go away.
Look in your device manager to see if there are any problems showing there.
Try to restore to before this started happening.
Is the device integaral to your motherboard? If so reinstalling the motherboard drivers may help.
List your motherboard and other specs in any problem can help us help you.
Google the device for updated drivers.
What version of vista are you using?

I'm very thankfull for your help! But i'm not so good at hardware (or english) and stuff so please be patient =)

Has your computer always done this?
Yes, since i bought it in october

Do you use the adaptor? If not turn it off in the bios and the problem will go away.
What is an adaptor?

Look in your device manager to see if there are any problems showing there.
Can't find any problem there...

Try to restore to before this started happening.
Always happening.

Is the device integaral to your motherboard? If so reinstalling the motherboard drivers may help.
Both the sound and network card is integrated in the motherboard and i tried to install the drivers from Realtek's page.

List your motherboard and other specs in any problem can help us help you.
where can i find good info of my system? What do you need?

Google the device for updated drivers.
Don't know the name exactly... where can i find which motherbord i use?

What version of vista are you using?
I'm using Vista business x64

Since your computer has always done this, take it back to where you bought it for a refund.

But I bought it in parts and build it myself... =/
Du you have any idea what the problem could be?

If you built this computer yourself you will know the specs. (What hardware are you using? look at my signature for an example).

Try using the drivers on this page;

Download Realtek RTL8100/8101/8111/8168 serie (Pci-E) 5.654 Driver for Windows 95/98/9X/ME/NT/2000/2K/XP/2003 - Softpedia

Run a memory testing program.
What wattage is your psu?

Hi!

found som specs:
* Motherboard: MSI P35 NEO2-FIR S-775 DDR2 SATA2 GBLAN RAID ATX
* Processor: INTEL CORE 2 QUAD Q6600 2.4GHZ 8MB 1066MHZ S-775
* Memory: CORSAIR 2GB DIMM DDR2 800MHZ PC6400 CL5 (4X1GB)
* GraphicCard: MSI GEFORCE 8600GT 256MB HEATPIPE PCI-E
* PowerSupply: CORSAIR HX 520W PSU ATX12V 2.2 / EPS12V

Do you know any good memorytest softwares? I tried to search for one put the ones i found was not free...

The driver you recommended did not start to download when I tried, but i will try again later...

Thanks again! I really appreciate your help!
//Teodor

Realtek

lets try those drivers..and there are plenty of memory tests...
u can use the one on vista
go to the search and type in
memory diagnostics tool Memory Diagnostics Tool


Free Software
i prefer prime95..it works great