This Move Player is a mess. On my Vista machine, I can watch Fox, The CW, and ESPN 360, but not ABC. It's the same with IE7 or FF3. On my XP system, with SP3, ABC plays just fine. So, it's not my router but something else.

I uninstalled the player in Firefox, then installed it from the movenetworks.com site that Scott listed. I went from 71101000055 to 7103010. If those are version numbers, I have no idea what they mean. Another interesting link at movenetworks.com is the "Showcase" on the front page in the upper right corner (it's a script, so I can't link to it). This shows off some fancy features of the player.

One more thing that I saw was this FAQ answer at ESPN about how to uninstall the player, including older versions:
http://sports.espn.go.com/broadband/espn360/faq#20

I've tried installing from ABC, Fox, CW and movenetwork.com on IE. I've only tried ABC and movenetwork on Firefox. I've tried saving it to my desktop and opening it from there. I've uninstalled and tried to install this thing a million times...with and without pop-up blocker, Firewalls(Windows & McAfee), antivirus. (It's always the 07103010.exe version.) Everytime it says it installs (CW actually plays an ad while I wait for the episode to play) and then it says an error has occurred. (I also saved it to my desktop and tried from there. Would emailing the plugin make a difference?)

As I said, I've got a laptop that downloaded it on Fox in one shot. What the heck is up with this pc?? Is there any info about this pc that you need?

It's worth a try.

Sent, good luck.

The closest I could find is npnul32.dll in the Mozilla plugins folder.

OK, from Explorer
C:\
Users
(yourname)
AppData
Roaming
Mozilla
Firefox
Profiles
Extensions
MovePlayer @MoveNetworks.com
Platform
WINNT_x86-msvc
Plugins

Within the Plugins folder you should find a .dll file that begins with npmn....
Delete that file and replace it with the one sent by email.
Pray?

No, its a different plugin altogether. Let's try IE tomorrow. I can watch ABC on IE, soooo...

Success finally. I have no inside tech secrets, but this worked for me....

I had problems getting the MoveMediaPlayer plugin to work on my desktop PC that runs XP with SP3. I tried numerous times trying to download the plugin from ABC.com or www.movenetworks.com/install-move-player, but it never worked in either Firefox 3.5.4 or IE8. I always received an error after downloading the plugin and attempting to run it saying "MoveMediaPlayerWin_071505000010.exe was not a valid Win32 application." It seemed to me that the download failed since the file had 0 KBs.

So I attempted to load the plugin on my laptop which runs Vista. Both of these computers run on my same network, and have the same versions of browsers, Firefox 3.5.4 and IE8. I was able to successfully download the plugin on my Vista laptop using Firefox and run the file and watch video from ABC.com. To get it to run on my XP dekstop, I copied the MoveMediaPlayerWin_071505000010.exe (1.37 KB) file from the laptop to the desktop, and it successfully installed, and I was finally able to watch video from ABC.com on my desktop. I don't know why I always had problems trying to download and run the file on my desktop PC, even after changing setting in the web browser security settings, firewall, etc. I didn't adjust anything on my laptop, and the file downloaded and installed without a problem. This solutions worked for me, maybe it will for you, e.g. or have someone else download the MoveMediaPlayerWin_071505000010.exe file and email it to you (you may need to change the .exe extension in order to email it, I changed it to .exp, emailed it, then changed it back to .exe before running).