Error 0xC0050061

Value: -1073414047 | 0xC0050061 | 3221553249

What does it mean ?

MCA_ERROR_PCI_BUS_UNKNOWN  
Machine Check Event reported is an unknown fatal PCI bus error reported to CPU %1. %2 additional error(s) are contained within the record.
Value: 97 | 0x0061 | 0b0000000001100001

Where does it come from ?

FACILITY_MCA_ERROR_CODE  
Machine Check Architectures (Intel Pentium Pro and Itanium processors)
Value: 5 | 0x005 | 0b00000101

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Other Errors for FACILITY_MCA_ERROR_CODE