écran qui devient bleu

bonjour, j'ai un gros soucis avec mon ordi ; dès que je veux faire les mises à jours ou lancer le scan de mon antivirus (antivir) mon ordi s'éteind et l'écran devient bleu avec le message suivant :
a problem as been detected and windows has been shut down to prevent damage to your computer. If this is the first time you've seen this stop error screen, restar your computer. If this screen appears again, follow these steps:
check to make sure any newhardware of software is properly installed manufacturer for any windows updates you might need.
If problem continue, disable or remove any newly installed hardware of software. Disable bios memory options such as caching or shadowing. If you need to use safe mode to remove or disable components, restar your computer. Press f8 to select avanced startup options, and then select safe mode.
technical information
*** STOP: 0x00000007 (0x00000001, 0x00000000, 00000000, 0x8aa46c90
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.
cela fait une semaine que je cherche des solutions mais sans succès. merci de venir à mon secour.