Converting these files for Mac

Question

Hello, I am having alot of difficulty getting these .AVI files to run on my Macintosh. The files play the correct duration, but there's a different problem with each that doesn't allow it to work. For the first file, there's no audio at all (my speakers work fine), and the picture is entirely black. I tried using DivX Doctor II but all it fixed was the audio. The video is still not appearing at all. I tried using DivX Converter (which took a long while), and the only change was that the picture now is all white rather than black. I wanted to burn this file to a DVD, but putting it in Toast Titanium didn't change it either. I've been looking all over the internet and have downloaded stuff hoping it would help and I have no luck (Flip4Mac, for example, did nothing at all). Quicktime tells me there may be something about this file that requires a codec I don't have, so it takes me to their page, but I didn't see anything there either. http://www.apple.com/quicktime/resources/components.html
More information about the first file:
Format: WMV3, 640 x 480 pixels size, Millions (of colors I assume), MPEG Layer 3, Stereo, 48,000 kHz
FPS: 24.04
Playing FPS: (Available while playing)
Data Size: 290.64 MB
Data Rate: 1785.75 kbits/sec
One difference I've noticed in AVI files I can play is that the Format is DivX 5.0 rather than WMV3. This apparently has something to do with me not being able to view these on the Mac. With my PC, with VLC player especially, they run fine. But they don't work on my Mac, even with the Mac version of VLC, and even so I don't see how it'd help with getting Toast to see it. All I can see to do is convert these files. I posted about this on a different forum and was told they can only be converted on a PC. But I have no idea what to use to convert them. Here's the information on the other two files:
Second file:
Video, but no audio at all
Format: Generic MPEG-4, 704 x 400, Millions
'ms ', Stereo, 48.000 kHz
FPS: 23.98
Playing FPS: (Available while playing)
Data Size: 919.70 MB
Data Rate: 1765.84 kbits/sec
Third file:
No video, and the audio glitches constantly.
Format: MP42, 640 x 360, Millions
MPEG Layer 3, Stereo, 44.100 kHz
FPS: 23.98
Playing FPS: (Available while playing)
Data Size: 183.64 MB
Data Rate: 3925.53 kbits/sec
If anyone can tell me how to convert these, whether it be on a Mac or a PC, I'd be very grateful. I really need these to work on a Mac, preferably on the Toast Titanium program, so I can make DVDs out of them. I'm really at a loss. Thanks.

Answer 1

VLC for Mac? For the first, it says "An error has occured which has probably prevented the execution of your request: main: no suitable decoder module for fourcc `WMV3'. VLC probably does not support this sound or video format."
For the second, it says "An error has occured which has probably prevented the execution of your request: ffmpeg: more than 5 seconds of late video -> dropping frame (computer too slow ?)"
VLC will play the third, but I still can't get Toast Titanium to see it.