link removed because the .dmp file has been deleted from Skydrive as I have already received help. The link is being used for other questions.
Note that this is not my computer. I am assisting someone else with this problem. Also, the PC is a Dell OptiPlex 755. All I know about the computer is what is outputted in system properties. I do not know where to find additional information, as a Dell website search is not helpful. Only antivirus program is MSE, and Service Pack 1 is installed. Further questions are welcome.
Things I have already tried:
various chkdsk parameters.
Windows Memory Diagnostic (the one that is part of Windows 7) shows no errors.