Hello,
I apologize for the inconvenience you are experiencing. I'm curious about your situation but unfortunately I don't think I fully understand what it is that you would like to accomplish.
It sounds like you know you have a bad hard drive, and if I'm understanding you correctly you would like Toolbox to ignore the fact that Windows has already diagnosed it defective, in order for the test to complete inside Toolbox and provide you with test results?
Please note, that running diagnostic tests, especially any type of stress test, on a known bad hard drive should be avoided. Running diagnostics on a known defective device will only increase the chances of the device failing entirely.
It's worth mentioning that Toolbox pulls a large amount of the information it reports on straight from your Operating System. I have not been faced with this first hand, but there is perhaps a chance that you can go into the 'Hardware' section of the Toolbox application, and assuming it is providing you a warning related to what Windows has already diagnosed, you may be able to chose to 'Ignore'. Afterwards, now that Toolbox is ignoring what Windows has diagnosed, the test may now be capable of completion. Again, this is not recommended and I would avoid running any other diagnostic tests on your defective hard drive so long as you need to use it.
-Dan R.