I am taking my laptop with me on a school bus trip, and I want to use an Ad-Hoc network to host a multiplayer Minecraft server. I have heard, however, that Ad-Hoc networks have a vulnerability that makes it possible for people to access your computer's hard drive. While I doubt that anyone else that will be on the bus with me will know how to do this, I want to be certain that I am protected from this.
I am using Windows 8.1 Pro x64, and I have already verified that in the "Network and Sharing Center", all settings for File Sharing over a network are turned off. (I don't plan to use this with the Ad-Hoc network. If I ever need to share a file, it will be through FTP.)
What could I do to ensure that my network is as safe from this, or any other type of attack?
Note: I do not have a password on my Administrator account. Is this is a concern for protecting my drive from being accessed since I have disabled file sharing?