Why is my computer still restarting without warning?

My computer was restarting randomly on Windows 7 32-bit. I didn't know why. I did a clean install on Windows 7 64-bit and it's still restarting randomly and without warning. I disabled automatic restart but it still does it. I bought more fans so my comp is at a pretty good temperature. What's... show more My computer was restarting randomly on Windows 7 32-bit. I didn't know why. I did a clean install on Windows 7 64-bit and it's still restarting randomly and without warning. I disabled automatic restart but it still does it. I bought more fans so my comp is at a pretty good temperature. What's wrong?

OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
System Manufacturer Gigabyte Technology Co., Ltd.
System Model GA-MA770-DS3
System Type x64-based PC
Processor AMD Athlon(tm) 64 X2 Dual Core Processor 6000+, 3000 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F7, 1/5/2009
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7600.16385"
Installed Physical Memory (RAM) 3.00 GB
Total Physical Memory 3.00 GB
Available Physical Memory 1.86 GB
Total Virtual Memory 6.00 GB
Available Virtual Memory 4.79 GB
Page File Space 3.00 GB
Page File C:\pagefile.sys
Update: PS: I get a critical error #41: Kernel-Power in the event viewer
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