Windows 7: Long Startup screen and Blue screen every 2-3 hours

Hello, I'm not sure why i have such long start up screens, or what information you may need. But after my blue screen i log back into windows 7 RC and this shows up:

Windows has recovered from an unexpected shutdown

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7057.2.0.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: a
BCP1: 0000000000000010
BCP2: 0000000000000002
BCP3: 0000000000000001
BCP4: FFFFF800030471C5
OS Version: 6_1_7057
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\011110-187466-01.dmp
C:\Users\Steven\AppData\Local\Temp\WER-241005-0.sysdata.xml

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C:\Windows\system32\en-US\erofflps.txt

We need the dump - otherwise try Who Crashed:

Resplendence Software - WhoCrashed, automatic crash dump analyzer

Analysis
Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.


On Mon 1/11/2010 9:35:02 PM your computer crashed
This was likely caused by the following module: dxgkrnl.sys
Bugcheck code: 0x3B (0xC0000005, 0xFFFFFA6006CFA072, 0xFFFFFA600B098C00, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
Dump file: C:\Windows\Minidump\Mini011110-01.dmp
file path: C:\Windows\system32\drivers\dxgkrnl.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: DirectX Graphics Kernel
The crash took place in a standard Microsoft module. Your system configuration may be incorrect, possibly the culprit may be another driver on your system which cannot be identified at this time.



On Sun 1/10/2010 10:00:56 PM your computer crashed
This was likely caused by the following module: dxgkrnl.sys
Bugcheck code: 0xC2 (0x7, 0x110B, 0x5060000, 0xFFFFFA8004082D40)
Error: BAD_POOL_CALLER
Dump file: C:\Windows\Minidump\Mini011010-02.dmp
file path: C:\Windows\system32\drivers\dxgkrnl.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: DirectX Graphics Kernel
The crash took place in a standard Microsoft module. Your system configuration may be incorrect, possibly the culprit may be another driver on your system which cannot be identified at this time.



On Sun 1/10/2010 8:07:06 PM your computer crashed
This was likely caused by the following module: dxgkrnl.sys
Bugcheck code: 0x3B (0xC0000005, 0xFFFFFA6006D1D076, 0xFFFFFA600BA8E760, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
Dump file: C:\Windows\Minidump\Mini011010-01.dmp
file path: C:\Windows\system32\drivers\dxgkrnl.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: DirectX Graphics Kernel
The crash took place in a standard Microsoft module. Your system configuration may be incorrect, possibly the culprit may be another driver on your system which cannot be identified at this time.

Update your drivers with the guide in my sig - especially for the 4850 and also the latest DirectX - use Driver Sweeper and then make sure your case is clean and is not too hot.

i've tried, but everytime it scans it keeps popping an error up saying "windows- drive not ready Exception processing message 0xc00000a3 parameters 0x000007FEFDC17240 0x000000000000004'0x0000007FEFDC172400x0000007FEFDC17240

Unplug any USB drivers, disable floppy support in the BIOS, and use Malwarebytes to scan your pc for malware after updating - a full system scan. Then try using Driver Sweeper again. If the scan brings something up, scan again in safe mode.