There seems to be an issue with Contra for NES.
I get a pop-up dialog box that says "An error occurred while loading the file."

vanelan : Depending on which version you are trying to load "There are Several" It probably has something to do with the file not downloading fully.

You can go into your Vizzed directory on your hard drive and delete the file for Contra. This will force it to re-download next time you load the game. The directory is different depending on which version of windows you are using. If you need help with this, let me know which version of windows you are running and I can help you out.

That or you could try to play it using the alternate emulator "Mednafen" just load the game like you normally would, then click the link in the upper left hand corner of the game window labeled "Play using Mednafen"

The nice thing is, this emulator allows full-screen gameplay (alt+enter on your keyboard with the game window active) as well as video recording of gameplay.

Jordanv78 : Mednafen doesn't seem to be working either.
Where would the files be on Windows 7?

Other games seem to work tho. I played SMB3 and a hack.
Dunno if that matters...

vanelan : It should be in the following location. Feel free to delete the file. From there it should force you to re-download the file when you click the link to "play game"

C:ProgramDataVizzedVizzedRgrPluginRoms

Jordanv78 : Still seem to be having an issue. Its just strange that this is the only rom I have an issue with.
I deleted everything "Contra" just to be sure.

I dunno if it means anything, but it downloads as Contra.prg.

The game was sharing the same file name as the Commodore 64 version of Contra, so the Plugin was attempting to load the C64 version in the NES emulator. It's fixed now though.

Thanks guys.

Now I also know where all the files get downloaded.

Well, I'm guessing this got solved...

So, I shall close it, If you want this reopened, just send me a PM.