I recommend that novice computer users call up technical support for questions such as these. Setup issues are among the hardest to troubleshoot, and also the least likely for other users to have experience with. A bug in the program can be reproduced at will. But we only run setup once (or a few times), and usually there's no problem.
P.S. It would also be a good habit to get into to copy error messages exactly, word for word. Otherwise, it's hard to tell what's failing.