Editing trouble!HELP.

[Antwan]

Well it's an easy thing to get frustrated about when dealing with computers
but you can't let it get to you.
Things stop working randomly, it just happens.
You need to do a process of elimination with these type of issues.
So you convert the files and they still have an issue playing in videopad
The clips DO play on the website I assume as you had not mentioned an issue there.
So that's a good thing.. more than likely not an issue with your computer.
You might try uninstalling and reinstalling Videopad editor
Personally I hate that editor.
You might consider a new one all together, how you get it is up to you.
I have not had a good experience using that one personally.
Sony Vegas is what I use on windows. On linux I used KdenLive.

You can actually use a USB Drive to install an instance of Linux and use Kdenlive
all on a bootable image, everytime you boot up your usb you will be in the linux operating system.
I would not suggest this method right off the back but it's something people should know about.
If you are unable to get anything else working kdenlive is basically a Sony Vegas for Linux Operating systems.
Video here, if all else fails: http://www.youtube.com/watch?v=2ohKkEK280w