Windows 7: Any clues in this minidmp viewer?

Dozens of minidmps this month, hundreds overall. Attempts to load the special BSOD utility on this forum fail with error message, but I have the BlueScreenViewer data. All BC Codes "a" with the exception of one BC Code 50. The advice I find on MS site seems to be try haphazard steps to isolate the problem. Do the minidmps provide no useful information? Is there no deterministic approach to isolate the problem? I have run the preboot memory test with no error messages. PC Doctor finds no problems. The BC Code "a" seems most often to happen when I am away from the computer. Do the addresses and driver names in the minidmp give any clues at all?

Follow http://www.sevenforums.com/crashes-d...tructions.html

I have followed the instructions for SF Diagnostic Tool v5 as best I could. (Though I did get some error messages) I do have a folder named SF_03-09-2012, containing various dmp files and other files. I downloaded an evaluation version of WinZip. If I need more instructions in complying with procedures, please let me know

Should I expect no substantive response to my original question? Paraphrasing: although there are many pieces of data in the mindump I first posted, and presumably much more in the SF Diagnostic Tool dumps I attached approx a week ago, can these pieces of data lead an expert to a clue about why the Bug Check Code "a" keeps leading to BSOD?