I am sorry to hear that one of our tests is failing on your computer. The first thing I would suggest is to make sure that your video drivers are up-to-date since that can report incorrect information to our software (It's a good idea to check using the latest version from Dell and also from the video card manufacturer), possibly causing it to report an error. I would also suggest performing a memory stress test to rule out the possibility of bad system memory affecting the results.
If a driver update doesn't resolve the issue and you don't have any memory errors, then it is likely that there is an actual problem with your video card.
Please let me know if you have any other questions or issues.
Thanks,
Kris