Note that you're getting 0x124 stop errors, and the 0x124 code is WHEA_UNCORRECTABLE_ERROR, which means your system's CPU reported a hardware error that could not be corrected without stopping the system. Windows thusly bugchecks to stop the system to avoid further damage to your computer. Your dumps indicate the problem is an undocumented (by Intel) hardware error that isn't defined or classified in the known Intel CPU WHEA codes. Also note that updating drivers will not help you at this point, as the problem is not software-related:
Code:
1: kd> !errrec fffffa8006da7028
===============================================================================
Common Platform Error Record @ fffffa8006da7028
-------------------------------------------------------------------------------
Record Id : 01cbfe08da5c61c4
Severity : Fatal (1)
Length : 928
Creator : Microsoft
Notify Type : Machine Check Exception
Timestamp : 4/18/2011 21:01:22
Flags : 0x00000000
===============================================================================
Section 0 : Processor Generic
-------------------------------------------------------------------------------
Descriptor @ fffffa8006da70a8
Section @ fffffa8006da7180
Offset : 344
Length : 192
Flags : 0x00000001 Primary
Severity : Fatal
Proc. Type : x86/x64
Instr. Set : x64
Error Type : Micro-Architectural Error
Flags : 0x00
CPU Version : 0x00000000000106a5
Processor ID : 0x0000000000000001
===============================================================================
Section 1 : x86/x64 Processor Specific
-------------------------------------------------------------------------------
Descriptor @ fffffa8006da70f0
Section @ fffffa8006da7240
Offset : 536
Length : 128
Flags : 0x00000000
Severity : Fatal
Local APIC Id : 0x0000000000000001
CPU Id : a5 06 01 00 00 08 10 01 - bd e3 98 00 ff fb eb bf
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
Proc. Info 0 @ fffffa8006da7240
===============================================================================
Section 2 : x86/x64 MCA
-------------------------------------------------------------------------------
Descriptor @ fffffa8006da7138
Section @ fffffa8006da72c0
Offset : 664
Length : 264
Flags : 0x00000000
Severity : Fatal
Error : Internal unclassified (Proc 1 Bank 5)
Status : 0xfa00000000400405
1: kd> !sysinfo cpuinfo
[CPU Information]
~MHz = REG_DWORD 2786
Component Information = REG_BINARY 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
Configuration Data = REG_FULL_RESOURCE_DESCRIPTOR ff,ff,ff,ff,ff,ff,ff,ff,0,0,0,0,0,0,0,0
Identifier = REG_SZ Intel64 Family 6 Model 26 Stepping 5
ProcessorNameString = REG_SZ Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz
Update Signature = REG_BINARY 0,0,0,0,11,0,0,0
Update Status = REG_DWORD 6
VendorIdentifier = REG_SZ GenuineIntel
MSR8B = REG_QWORD 1100000000
In table B-5 from the Appendix of the Intel Nehalem Software developer's manual (PDF document here - it's pretty big), we can tell that we need to look in section 15.3.2.2 of the actual SDM (again, PDF here - it's bigger 
) to decode what machine check error "0xfa00000000400405" means - it's an unclassified/undocumented internal Intel CPU error code. Unfortunately, since it's not documented, I cannot tell you specifically what the problem is. I can, however, tell you the problem is in fact being reported from the CPU directly, and you should be contacting Intel for further support so they can tell you specifically what the error is (it might not actually be a hardware issue, but it doesn't look good). I've seen this error be caused by incorrect BIOS settings for memory (RAM) speed and the multipliers being too high (for example, running 1333 memory at 1066). Usually, though, this is a bad CPU. It's worth making sure your CPU speed and memory timings in the BIOS are correct, though. Otherwise, you probably want to contact Intel for analysis before trying to replace hardware, just to be sure, if it really is a bad CPU.
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