Hi VanessaLynnAPR,
I'm sorry to hear that Test Day didn't go as well as planned. While the issue that you had with re-entering the Computer Lab likely impacted your performance, we have to be careful about assuming that it was the only reason you underperformed. When these types of score drops occur, the two likely "causes" involve either something that was unrealistic during practice or something that was surprising (or not accounted for) on Test Day. Before we discuss any of those potential issues though, it would help if you could provide a bit more information on how you've been studying and your goals:
To answer your immediate question - Business Schools generally do not care if you take the GMAT more than once, so having this initial Score on file is not necessarily a 'bad' thing. If you're concerned though, then go ahead and cancel it. In addition, if you'd like to know more about how an individual Program views this issue, then you should reach out directly (to the Program's Admissions Department) and ask - the School's representatives would likely be happy to answer any questions that you might have.
Studies:
1) How long have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
3) On what dates (or approximate dates) did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your overall goal score?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
If you took your GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich