I registered the card, but it is still not going through, I have no idea what i'm suppose to use for the cardholder name since it doesn't have one. Really would appreciate some help.

Pre-paid cards in the United States can't be used for international purchases anymore since March 31st 2012. GOG payments are considered international purchases if done direct. You should be able to use it through the Paypal check out option without having to make a Paypal account.

Actually, some can. The one I got at the bank worked from these people
https://www.harlandclarkegiftcard.com/

Although, always be sure to ask just in case.

I just tried that paypal option, and I got the same problem.

How long ago was it when you registered the card on the vanilla mastercard website? The last time I got a pre-paid card and used it for internet purchases it said to give 24 hours for the info to process before making any purchases.

I know pre-paid cards work with Paypal as I've bought stuff with them on other sites in the past.

It says It was activated on the 22nd, and I registered the card today.

I found a video saying how to register the card, which you said you have done, but incase it might be any help here it is.

http://www.youtube.com/watch?v=1py7-vvnhXY

For the card, you are using the same zip code you registered in when making a purchase right? Once the zip code is registered, you can use any name/address as long as the zip/postal codes match. Also if you log back in to the website, it should show in the transactions log where you just tried to use it and what the problem was.

Yeah I had already seen that exact video actually, and I followed every direction in it. I guess I might have to give the support line a call.

Probably so. I called one before when I couldn't make a purchase from a website in Europe and was told they didn't support international purchases. However paying through Paypal has worked before.

Give support a ring tomorrow if you can and see what they say.