blue screen help

hi please could help with these 3 mini dump crashes.

Dump File : 052814-46191-01.dmp
Crash Time : 28/05/2014 22:10:38
Bug Check String : PAGE_FAULT_IN_NONPAGED_AREA
Bug Check Code : 0x00000050
Parameter 1 : fffff680`023aff88
Parameter 2 : 00000000`00000000
Parameter 3 : fffff800`02caac37
Parameter 4 : 00000000`00000002
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+80640
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18409 (win7sp1_gdr.140303-2144)
Processor : x64
Crash Address : ntoskrnl.exe+80640
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\052814-46191-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 290,096
Dump File Time : 28/05/2014 22:12:57
==================================================

2)

==================================================
Dump File : 053014-28626-01.dmp
Crash Time : 30/05/2014 22:39:44
Bug Check String : MEMORY_MANAGEMENT
Bug Check Code : 0x0000001a
Parameter 1 : 00000000`00041790
Parameter 2 : fffffa80`01829a90
Parameter 3 : 00000000`0000ffff
Parameter 4 : 00000000`00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+75bc0
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18409 (win7sp1_gdr.140303-2144)
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\053014-28626-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 291,680
Dump File Time : 30/05/2014 22:41:50
==================================================

3
==================================================
Dump File : 060414-26660-01.dmp
Crash Time : 04/06/2014 19:16:08
Bug Check String : MEMORY_MANAGEMENT
Bug Check Code : 0x0000001a
Parameter 1 : 00000000`00041790
Parameter 2 : fffffa80`017d66c0
Parameter 3 : 00000000`0000ffff
Parameter 4 : 00000000`00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+75bc0
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18409 (win7sp1_gdr.140303-2144)
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\060414-26660-01.dmp
Processors Count : 2
Major Version : 15


many hanks Richard
the screen turns blue and just restarts