Bluescreen / DMA CRC error

Bonjours, je viens tout juste de formaté mon ordinateur et je recrois plein d'erreur et de ''bluescreen'' je sais plus quoi faire.....

j'essaie de faire mes MAJ de windows mais pendant le downloads je recois des bluescreen

Pour couronné le tous j'ai des CRC error lorsque j'essaie d'installé certain jeux et mon drivre de carte graphique.

Aussi jai Superfetch as stopped working qui pop a chaque fois que je restart mon ordinateur

Windows Vista Edition Familiale Premium sp1
DFI Inc. LP DK X48-T2RSB PLUS 1.0
Intel Core 2 Quad Q9550 Yorkfield Socket 775 LGA (@45 nm) 2833 Mhz
NVIDIA GeForce 9800 GTX+ (G92,,512 Mo)
Mémoire physique totale: 4096 Mo, Type: DDR2

Voici les report de certain bluescreen

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 3084

Additional information about the problem:
BCCode: a
BCP1: 00001034
BCP2: 00000002
BCP3: 00000001
BCP4: 81A13FE9
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini011812-05.dmp
C:\Users\Jesse\AppData\Local\Temp\WER-98828-0.sysdata.xml
C:\Users\Jesse\AppData\Local\Temp\WER9A66.tmp.version.txt
__________________
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 3084

Additional information about the problem:
BCCode: c2
BCP1: 00000007
BCP2: 0000110B
BCP3: 32F0002D
BCP4: 060A0806
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini011812-07.dmp
C:\Users\Jesse\AppData\Local\Temp\WER-61609-0.sysdata.xml
C:\Users\Jesse\AppData\Local\Temp\WERE24.tmp.version.txt
__________________
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 3084

Additional information about the problem:
BCCode: c2
BCP1: 00000007
BCP2: 0000110B
BCP3: 00D32580
BCP4: 00020406
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini011812-08.dmp
C:\Users\Jesse\AppData\Local\Temp\WER-51140-0.sysdata.xml
C:\Users\Jesse\AppData\Local\Temp\WERD9F4.tmp.version.txt