If you are doing the re-installation then that is fine. I will let you do that and will not attend your list of errors at this point.
About your second question, if you are 100% sure about the md5sum check then that is all you can do at this point. Also verify you have installed the required linux packages. That is it. If the post installation check fails then we will deal with it at that point. Log files will tell you what is going on. But if you have followed the instructions to the core should not have an issue.
You can only ping your linux box using IP at this point until you add an entry in Windows hosts file.