Mi PC se crashea con una pantalla azul

Desde hace un tiempo mi PC se crashea y no se porque. He investigado y he analizado unos archivos dmp pero no me queda claro cual es el problema. Me suele pasar jugando a juegos aunque dicho juego vaya bien. Pongo ahora la información de mi PC y los archivos dmp

Computer name: RAC-PC
Windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
Hardware: Gigabyte Technology Co., Ltd., F2A88X-D3H
CPU: AuthenticAMD AMD A10-6800K APU with Radeon(tm) HD Graphics AMD586, level: 21
4 logical processors, active mask: 15
RAM: 8526934016 total

Crash Dump Analysis

Crash dump directory: C:\Windows\Minidump
Crash dumps are enabled on your computer.
On Sat 23/05/2015 15:26:56 GMT your computer crashed
crash dump file: C:\Windows\Minidump\052315-22651-01.dmp
This was probably caused by the following module: dxgkrnl.sys (dxgkrnl+0x35CC4)
Bugcheck code: 0x3B (0xC000001D, 0xFFFFF88005251CC4, 0xFFFFF8800B250870, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\Windows\system32\drivers\dxgkrnl.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: DirectX Graphics Kernel
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time.
On Sat 23/05/2015 15:09:41 GMT your computer crashed
crash dump file: C:\Windows\Minidump\052315-19032-01.dmp
This was probably caused by the following module: usbport.sys (USBPORT+0x224DC)
Bugcheck code: 0x1000007E (0xFFFFFFFFC0000005, 0xFFFFF8800443A4DC, 0xFFFFF8800317E5D8, 0xFFFFF8800317DE30)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\drivers\usbport.sys
product: Sistema operativo Microsoft® Windows®
company: Microsoft Corporation
description: Controlador de puertos USB 1.1 y 2.0
Bug check description: This indicates that a system thread generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time.
On Sat 23/05/2015 13:18:34 GMT your computer crashed
crash dump file: C:\Windows\Minidump\052315-17347-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x748C0)
Bugcheck code: 0x50 (0xFFFFF00002C6F7A5, 0x8, 0xFFFFF00002C6F7A5, 0x7)
Error: PAGE_FAULT_IN_NONPAGED_AREA
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that invalid system memory has been referenced.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.