Help With BSOD and Shutting Down Problem

[Windows7Master]

My computer shuts down a lot all by it's self and sometimes shutdowns with a Blue Screen of Death. When it usually shuts down by itself it reboots and it tells me that my computer has failed to start so I choose Start Windows Normally then when the Starting Windows Screen comes up my computer gets a differnet Blue Screen of Death. I am not sure what it says when that comes up because it reboots itself after 1 second. I will list the errors and my computer information down below.
I get really stressed out over this. :banghead:
And I notice that my computer is very hot when this happens. It's an old computer so I don't know if that is causing the heat.

First Blue Screen of Death
Problem signature: BlueScreen
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: c000021a
BCP1: FFFFF8A004CF7F00
BCP2: 0000000000000000
BCP3: FFFFFFFFC0000001
BCP4: 00000000001005F0
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1


I don't have the information on this one only the code: 3b



Here is information on my Laptop/PC

OS Name: Microsoft Windows 7 Home Premium
Version: 6.1.7601 Service Pack 1 Built 7601
OS Manufacturer: Microsoft Corporation
System Manufacturer: Acer
System Model: Extensa 5230E
System Type: x64-based PC
Processor: Intel(R) Celeron(R) CPU 900 @ 2.20GHz, 2194 Mhz, 1 Core, 1 Logical Processor
BIOS Version/Date: Phoenix Technologies LTD V1.34, 8/11/2009
SMBIOS Version: 2.5
Windows Directory: C:\Windows
System Directory: C:\Windows\system32
Boot Device: \Device\HarddiskVolume1
Locale: United States
Hardware Abstraction Layer: Version = "6.1.7601.17514"
Installed Physical Memory (RAM) 2.00 GB
Total Physical Memory: 1.93 GB
Available Physical Memory: 950 MB
Total Virtual Memory 3.86 GB
Available Virtual Memory: 2.68 GB
Page File Space: 1.93 GB
Page File: C:\pagefile.sys

I am a huge computer geek , but this is confusing!

 

[FredeGail]

Hello Windows8Master and welcome to Sevenforums.

To be able to help you, we'd need you to attach some files to your post. This includes, crash dumps, nfo etc. To get these files, use our thread below.

http://www.sevenforums.com/crashes-debugging/96879-blue-screen-death-bsod-posting-instructions.html

Best Regards,
Frederik.