PC se sam vypne....

Dobry den, chtel bych pozadat Vas specialisty o radu.
PC je asi 5 let.
Aspire T671-PB7Z
Intel core 2 duo E 4300
250GB
1GB DDR II RAM
ATI Radeon X 1250Graphics
Intel(R) Core(TM)2CPU
6300 @ 1.86GHz
1.87 GGc, 896 MB
Windows XP prof 2002 Servis pack 3

Jeste do nedavna se casto 1-2 za den nekdy jen 3x za tyden sam vypnul vypinac, ale svitil a vydaval dlouhy piskot s dlouhou prestavkou. Otevrel jsem projel vysavacem, zahybal a zatlacil vse kam dosahnul zavrel a zase bezel.
Ted, asi tyden se pro zmenu sam restartuje a pise:

A problem has been detected and windows has been shut down to prevent dam to your computer.
PAGE_FAULT_IN_NONPAGED_AREA
If this is the first time you've seen this stop error screen, restart your computer, if this screen appears again, follow these steps:
check to make sure any new hardware or software is properly installed, if this is a new installation, ask your hardware or software manufacturer for any windows updates you might need.
if problems continue, disable or remove any newly Installed hardware or software. Disable bios memory options such as caching or shadowing, if you need to use safe Mode to remove or disable components, restart your computer, press F8 to select Advanced startup options, and then select safe Mode.
Technical Information:
*** stop: 0x00000050 (0xff801b2a,0x00000008,0xff801b2a,0x00000000)
Beginning dump of physical memory
Physical memory dump complete. , .
Contact your system administrator or technical support group for rurtner assistance.
Nevim co s tim. Jestli muzete, poradte.
Diky.
S uctou, Kelt.