BSOD BCCode:7a and f4

I have a problem appears from time to time
I get the blue screen , windows dumps some memory into a file and I get the following error report after it restarts:

I use Sony Vaio Laptop MODEL VGN-CR11GH
Windows 7 Starter 32bit and 2GB RAM


Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: 7a
BCP1: C0415718
BCP2: C000000E
BCP3: 148EF860
BCP4: 82AE31AF
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\100711-18018-01.dmp
C:\Users\User\AppData\Local\Temp\WER-35958-0.sysdata.xml

Read our privacy statement online:
Windows 7 Privacy Statement - Microsoft Windows

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt


and sometimes appears error with this code


Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: f4
BCP1: 00000003
BCP2: 87BCB598
BCP3: 87BCB704
BCP4: 82A25D60
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\100411-28392-01.dmp
C:\Users\User\AppData\Local\Temp\WER-49218-0.sysdata.xml

Read our privacy statement online:
Windows 7 Privacy Statement - Microsoft Windows

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

Code:

 I use Sony Vaio Laptop MODEL VGN-CR11GH 
Windows 7 Starter 32bit and 2GB RAM

Attachment 178324
Attachment 178325