Why can't I find movie files?

@bronzeknight, my guess is that your storage disk needs a clean up. I would start there as it can't hurt.

Start "Disk Utility," select your partition (you have the main drive and the partition underneath it), and click on "First Aid" then "Repair Disk" or if not directly allowed, start with "Verify Disk."

After that is done, perform "Repair Permissions" and repeat both repairs of disk and permissions to make sure the process is now shorter, meaning some clean-up did occur.

Even better (or in case repair fails), restart your computer in "Restore Mode" by pressing and holding "Command + R" during restart. Then choose "Disk Utility" and perform the repairs as per the above. What happens? Does space increase?

Also, check if you're downloading an update or upgrade from the App store. This could be eating up even more space, causing your free space to decrease.