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I am running Windows XP on an Intel x86 machine and I got an error in the instruction at memory location 0x00000001.
I am not worried about debugging the error, but I was interested to know what instructions would generally be located at the very begging of memory.
The only processors I have written low-level code for are PIC microcontrollers, and I know that the first memory location would be a GOTO and then the interrupt vectors.
Windows guarantees that the first 64k and the last 64k of memory will always cause an access violation to read or write. This makes detecting null pointer dereferences easier.
See the graphic in this page below the heading
Free, Reserved, and Committed Virtual Memory
http://msdn.microsoft.com/en-us/library/ms810627.aspx