Hello Mark,
Thank you for keeping us updated on the status of the issue and apology for the delayed response.
I would like to inform you that the best way to run the Check disk on the hard drive is from Windows Recovery Environment.
To do so, refer the following steps:
a. Insert the Windows 8 installation DVD in the DVD ROM and restart your computer.
b. After you boot your computer using Windows DVD, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key.
c. Select the correct time and Keyboard type.
d. Click on Repair your computer in the lower left corner.
e. Select Troubleshoot from Choose an option screen.
f. Click on Advanced options in Troubleshoot screen.
g. Click on Command Prompt. Command prompt Window will be open with X: prompt.
h. Type “ C: ” (without quotes) in the command prompt Window and press ENTER.
Note: This will change the drive path to the primary partition.
i. Then type “CHKDSK C: /F /R” (without quotes) in the command prompt Window and press ENTER to repair corrupt sectors, if there are any.
Important: While performing chkdsk on the hard drive if any bad sectors are found on the hard drive when chkdsk tries to repair that sector if any data available on that might be lost.
Hope the information helps.
Please reply with the results, in order to help you fix the issue.
Thank you