Recording Playback I've never had any troubles with this camera until now. Once I record a video, the playback is fine. However, once I out the video on any computer (I have tried many), the video skips, jumps, blurs, pixelates, ect. This happens to all my videos no matter the file size, length, ect. It has gotten to a point where I have stopped using it all together because it is pointless to even try capture videos that I will never be able to view. How can I fix this problem?

SOURCE: video management problem

sounds like you need to "recover" the hard drive.

Only other option you can try is to reset the camera.

SOURCE: Broken video management file/ recording failure

Although the instructions don’t make it clear, it seems to be important that the camera is turned off before you connect or disconnect the USB cable. The instructions do mention that you should not delete or rename files on the camera except in the EXT_MOV folder. The camera’s firmware is apparently quite fragile about file names and the presence of the extra hidden folders that both the Windows and Macintosh operating systems create when you delete something.

SOURCE: VIDEO MANAGEMENT

There is nothing you can do but to have it serviced as they will have to replace your promm which apperently is broken. This is internal software which is pre-programmed by factory and only the ones with the correct tools can replace this.
You will most likely break it beyond repair if you try it yourself.
Please follow LINK

SOURCE: Video Playback on a Everio GZ-MG57U

Sounds like you just need to upgrade your codecs. I use media player classic or VLC media player so I've never had these "not" play. Also another thing you will run into is the widescreen not showing properly when it does work. You have to convert the video to proper divx format with Xillisoft video converter in order for it to appear in 16:9 in all players. Makes the files 1/10 of the size too with little quality loss. Make sure you get the newest divx and xvid codecs, or a media player codec pack (easily found in google).

SOURCE: I have a JVC GZ-MG330. Today I was recording, and

Do not be that worried, in this case you still have chance to get back those video chips and you may need video recovery software to help, here are some programs you may rely on. Both programs can also recover photo and music files.

Video Photo Recovery Software (for Windows)
Mac Video Photo Recovery Software (for Mac OS X)

Tips: Take the memory card or stick out and connect to your computer via a card reader. Before your videos are recovered, do not attempt to save more files to the JVC memory card or stick in case the original files(your videos) are overwritten.