Vista bug écran bleu

Bonjour, alors voilà le problème a commencé il y a quel que mois j'étai sur internet et d'un coup l'écran est tout bleu et il affiche sa :"Problem has been detected and Windows ha been shut down to prevent damage to your computer.
POOL-CALLER
If this i 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 any windows updates you migbt need.
If problems continue, disable or remove any newly installed hardware or software.
Disble BIOS memory options such as catching 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 : OXOOOOOOC2(OXOOOOOOOD,OX866ADC3O,OX2O7O7249,OXO1OOOOOO)
Collecting data for crash dump...
Initializing disk for crash dump...
Beginning dump of physical memory.
Dumping physical memory to disk = 100
Physical memory dump complete.
Contact your system admin or technical support group for further assistance" ET là il redémarre mais maintenant c'est très fréquent et sa m'énerve.
Mon ordinateur est un : Acer Aspire X1700 et il est sous Windows Vista Edition Familiale Premuim.

AIDEZ MOI SVP