PFN list corrupt & irql not less or equal

Hi,

i'm having problems with my Windows 7 Home Premium 64 bits since last Thursday. I even tried to reformat it a couple of times but the error is still in my computer. I also used Scandisk to check if there was a problem in the hd but it didn't notice anything. The problem that occurs is that a bluescreen appears, sometimes it restarsts the computer and others the bluescreen just stock in my screen. The error that appears when it restarts is the following:

(Signature with problems)Firma con problemas:
(Event problem name) Nombre del evento de problema: BlueScreen
(OS version) Versión del sistema operativo: 6.1.7600.2.0.0.768.3
(Regional configurator id)Id. de configuración regional: 3082

(Aditional information of the problem) Información adicional del problema:
BCCode: 1000007e
BCP1: FFFFFFFFC0000005
BCP2: FFFFF88000DB2983
BCP3: FFFFF88002FF5968
BCP4: FFFFF88002FF51D0
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1

(Files that help to describe the problem)Archivos que ayudan a describir el problema:
C:\Windows\Minidump\121210-21964-01.dmp
C:\Users\Usuario\AppData\Local\Temp\WER-66752-0.sysdata.xml

(Read our privacy declaration online)Lea nuestra declaración de privacidad en línea:
Windows 7 Privacy Statement - Microsoft Windows (Windows 7 Privacy Statement - Microsoft Windows)

(If our privacy declaration is online is not available, read the privacy declaration online) Si la declaración de privacidad en línea no está disponible, lea la declaración de privacidad sin conexión:
C:\Windows\system32\es-ES\erofflps.txt


Thanks.

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