No read can do!

[Xaven]

The "vague unknown errors" are the only part of your post that would help anyone help you, and the only part that you didn't specify.

Goldwave reads "Could not open file. File does not exist or format is not supported."
Windows Media Player reads when trying to rip the music "Windows Media Player encountered an unknown error. This can occur when another program or operating system component encounters a problem but does not communicate the nature of the problem to the Player."

Do the filenames contain Japanese characters? If so, the program you're uploading them with, or the site you're uploading them to might not like that.
I know my image viewer crashes when it tries to open files with kanji and such in their filenames.

They did originally. When I uploaded the file, all the hiragana were replaced with Spaces (the tildes stayed intact). Just to be sure, I copied one of the files, changed the filename and all of its properties (Artist, album title, etc.) into English characters. Everything gives the same results as before.

Edit: Oh. Yeah, when I try to upload it, the webpage says it's finished (instantly) and there sits an object 0 KB big.

Sound only ?

Use Wavepad to rip the sound from your PC's stereo output. Save it as mp3 or other easy to upload format.

I've never been a fan of such indirect recording. The quality is always a tiny bit different or smudged compared to the original. D: (I may resort to this later, if I'm desperate)

what format were they ripped to?

mp3.