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Event ID: 46 Source: Microsoft-Windows-WHEA-Logger

A fatal hardware error has occurred.

Component: Memory
Error Source: Machine Check Exception

The details view of this entry contains further information.
Lenovo has in test BIOS 61KT40A which has corrected this error for me. Look to Lenovo changes for an explanation as to the source. This is how I troubleshooted the problem (it may help in narrowing down the problem): The system was a Thinkstation 415827U. It had 4 GB of memory and was running on two Intel Xeon X5550 2.67 GHz Processors. The BIOS was the most recent version -61KT35AUS. The system was running Windows 7 Professional 64 bit.

The error occured only on boot. The error originated in svchost.exe hosting the services Base Filtering Engine (BFE) Windows Firewall(mpssvc.dll) and Diagnostic Policy Services (DPS). The thread indicated in the event log associated with the error loads the image of bcrypt.dll  (Windows Cryptographic Primitives Library) it then closes the image and calls pnpts.dll  (Plug-n-Play Troubleshooter) then pshed.dll  (Platform Specific Hardware Error Driver). On a Win 7 Ultimate 32 bit system the latter two libraries are not called after bcrypt.dll is closed. I don't know how the WHEA-Logger system works but the sequence suggests the loading of bcrypt.dll trips the error.

The memory has been tested using the Windows memory Diagnostics tool in the Extended mode. The testing was run 10 repititions with no errors detected. Anyway, as mentioned before, it turned out to be a firmware problem.

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