That means you've partially uploaded new payment module files incorrectly.
Payment modules come in two parts: a module file and a corresponding language file. BOTH files must be present, and located in the correct folders. The files will have the same filename, but their contents will be very different. The one with all the define() statements in it is the language file.
If you upload one but not the other, or if you upload them to the opposite folder, or if you rename existing files, then you'll get the symptoms you're encountering.
You'll need to fix the mismatch of filenames and the file pairs.
A related tool to help find out which specific PHP error you're encountering as a result of the uploading, can be found here: http://www.zen-cart.com/content.php?124-blank-page
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Thanks for the Links, I am trying to make sure my FTP file tree looks like the one in the Overrides folder, but I am missing the 'classic' folders under includes/languages/english/extra definitions, and under includes/languages/english/modules/order_total I have Classic and payment instead of Classic and my custom template. Under includes/languages/english/modules/payment, I have authorizenet, linkpoin_api, and Paypal instead of Classic and my my custome template. Under includes/languages/english/modules/shipping, I only have Classic and not my custome template. I dont know how to fix this :/