So I think I've kinda fixed it by going to C:\Users\<MyName>\AppData\Local\AdventurOS\Settings.ini and changing the value of "main_drive" from "1.#QNANO" to "C". ("1.#C" created similar results as "1.#QNANO" but "C" seemed to work.)
Now that I can finally explore the drive, I did come across another major issue with this build: I'M INVINCIBLE!
While it's kinda cool to explore the drive and see how things generate without the fear of death, it obviously removes all difficulty from the game. And in the end, it'll remove the fun of it.
One other minor issue was a grammatical issue that occurred when I picked up an Electric book. I tried to use it with only 20 mp. (Later, after leveling up, I found out it requires 25 mp to cast.) The message the game gave me was "No Enough Mana". It /SHOULD/ read "Not Enough Mana."