A few questions:
What operating system are you running?
Do you have admin rights?
Do you have an antivirus program running (and can you disable while installing)?
You may want to look thru this troubleshooting guide for the 1904 error. It's a bit dated, but may give some ideas on what to try (if thinking about the questions above doesn't help)
35361 - Troubleshooting Error 1904
edit: btw, I have the Tom Sawyer folders and files on my machine too...