Premiere Pro :: Unable To Open Clip Video?

I have a video clip that I have edited, and once it finishes exporting, I cannot open it in any video playing application. Upon checking the file's Properites, it says that it is a 24 byte file... this can't be right. In the Export Settings window it says that it's several gigabytes!
 
I'm using a custom built PC, running the most up-to-date version of Windows 8. I have a quad-core Intel Ivy Bridge Processor, AMD HD Radeon 7770 GPU, 8 GB of 1600 MHz RAM, a 256 GB SSD running the OS and frequently used applications, and a 1 TB HDD. I am running Adobe Premiere Pro CS6 and it is completely up to date.
 
I have been digitally converting old VHS, 8mm, and miniDV tapes. I have a digtial converter that has Composite ports and an S-Video port on it. It connects to the computer via USB. I have a program called Debut Video Capture that records the video and saves it as an uncompressed .mp4 video file. Premiere Pro also has another issue where the audio and video are always out of sync because it can't seem to handle videos with variable framerates, so, I open the videos in Quicktime 7 Pro, and save them as a Reference Movie—This makes it so the videos are at a constant framerate. I take these files and import them into Premiere Pro. My sequence is DV - NTSC Standard 48kHz (the videos are all in an old 4:3 format). I'll drop the clips into the timeline and edit them, edit out the blue screens and splice different clips and such, lower the volume, and slightly increase the Scale in the Video Effects.
 
When everything is done... I'll open up the Export Settings.
 
I set the Format to H.264 and Preset to NTSC DV or NTSC DV Widescreen depending on the ratio of the video. Some of the videos are very long (1 Hour or longer... one video is almost 4 hours long). I will go down to the Bitrate Settings and change the Bitrate Encoding to CBR, and set the Target Bitrate to a reasonably high number. I try to have a minimum of 10 Mbps, or if the video isn't that large, I'll set it to 14. If the Estimated File Size is over like 3 GB (I'm not sure of the number, but it works for these long videos when they're under like 3 GB). If the videos go over, they'll encode for an hour or longer and when it's done, it will save and appear as a 24 byte file.
 
The only thing I've got is to make the Target Bitrate very small, that's the only way the videos will encode, but then the quality degrades...