External Hard Drive Not Showing Files

Question

Hi. I'm really in a panic right now because school starts tomorrow and a problem occurred with my external hard drive today. Before I start, I would like to clarify that I use a Macbook Pro 15" (not Retina Display). Here is what happened:
Around 6 months ago, I was organizing the contents of my external hard drive into folders (i.e. "Movies" > "Romance," "Action," "Horror," etc.). In the midst of doing so, my laptop kind of froze and before I knew what was happening, the contents of the "Movies" folder was invisible. The "Movies" folder itself was still visible and accessible, but its contents were not. When I double-clicked the "Movies" folder, nothing would be shown. It was as if it was empty. The problem is that something was still taking up space on my external hard disk. When my friends asked to copy some of my movies onto their computers, I agreed and saw that they could access the "Movies" folder on their Mac laptops! This means that it was probably a problem with my Mac laptop. I decided to ignore it because I was still able to access the contents of the folder if I plugged in my external hard drive into my TV (it's an LG TV).
Today, I decided that I've had enough with the invisible folder. I needed to access movies from the folder and because I couldn't access it, I got very stressed and decided to repair it myself. It was probably one of the worst decisions I've ever made.
I opened Disk Utilities and clicked "Repair Disk" and then "Verify Disk." I then clicked "Repair Disk" again just to be safe (which was absolutely stupid in hindsight). Hoping it would have solved the problem, I ejected my external hard drive and plugged it back in. Once I plugged it in and opened it, I was faced with this:
There was absolutely nothing else visible in my external hard drive. The reason I'm still fighting to fix this and not throwing out the hard disk is that when I got the info of my hard drive, a lot of space was still taking up my hard drive. Here is what I did (the name of my external hard drive is "Mines of Moria"):
Mines of Moria > right-click > Get Info
Once the info was shown ("Mines of Moria Info"), I saw this:
Do you see how annoying this is?! It clearly states that there is only 17.78 GB left on the external hard drive meaning that there are a LOT of files on this hard drive considering its capacity is 1 TB, but I can't access or see anything inside the external hard drive! I tried to open my hard drive on my brother's Alienware (Windows 7), but it couldn't open it because its format. I also tried plugging it into my LG TV and the only folder visible is the "found.000" folder and I can't access it.
Please give me some advice as to what I can do as soon as possible. I am willing to go to a store to fix it, but I would much rather try to do it myself at home. I transferred all my movies from my laptop to this external hard drive because I had no more space on my laptop (yes, almost 90% of the space taken up on my external hard drive is used up by movies and episodes).
Please help me. I also have school files on here (granted, they are from two years ago, but you never know when you're going to use them). I'm a HUGE movie junkie and I've downloaded so many movies that I don't even remember what I downloaded last week (I just can't keep track of which ones I've downloaded when).
This is really important to me, so I would be VERY grateful for any and all relevant and helpful tips and advice.

Answer 1

The problem is caused by the third-party software you installed in order to make NTFS volumes writable. Refer to the developer for support. You might be able to repair the volume in Windows using the CHKDSK program.