To overcome the Access Denied issues for minidump files: In the Windows > Minidump folder, right click on the file and choose Properties, then the Security Tab. Click Edit, then Add, then Advanced. Click Find Now, scroll down to the bottom and choose the Users group. Click OK, and then OK again. Tick the permissions boxes for full control, click Apply and then Yes, then OK and then OK again. You’ll see the lock icon has been removed from the file name.
Download Debugger Toolkit from Windows http://www.microsoft.com/downloads/en/details.aspx?FamilyID=6b6c21d2-200...
When installing, only install the Debugging Toolkit, the other files are not needed. Open WinDbg and under File > Symbol Search Path set this:
Then create the SymCache directory if it is not already created.
Now, double-click on one of the minidump files. You may have to tell the file Open with...
The WinDbg program will say "Could not create process...not a valid Win32 application." Just click OK. Go to File and Open Crash Dump. When you see the message with the analyze link, click it to copy it and paste it in the bottom command line and hit enter to execute it. Wait for the info to appear and then save the output as a textfile. Processing takes times.
These files all say what Probably caused the error towards the top.
http://social.technet.microsoft.com/Forums/en/w7itprosecurity/thread/d14... (specifically the post from May 21st)