D2NT31 NTBot42 Tutorial

[Blue]

What I'm about to post is from blizzard support, although I suggest just redownloading the patch.
Patch = Blizzard Support

Otherwise:

Are you receiving a message saying: "Unable to identify Application Version"?

If you are receiving an error message that says "unable to identify application version", then your game data may have been altered or corrupted in such a way that Battle.net no longer can determine if you need the patch.

When you connect to Battle.net, it will check the version of the game you have installed and patch the game to the latest version if necessary. If Battle.net cannot determine the version of the game you are running, then it will not allow you on. Only the latest game version will be able to join Battle.net. First, just to rule out any type of connection problem and to make sure you are not getting a false error message, please try to join Battle.net a few times in a row.

If you are using Windows Vista, the first thing to try is to launch the game in Administrator mode. Right click on the game icon and a popup menu should appear, select Run As Administrator from this menu to see if this allows the game to start correctly.

Also, make sure you are using the original game CD in your CD-ROM drive. Any programs or patches that allow the game to run without the CD in the CD-ROM drive are not supported and may cause this error.

In addition to third-party programs causing this problem, a virus may alter the game data and prevent you from joining Battle.net.

VIRUS CHECK: Please make sure that you are using the most current update for your virus detection software. If a virus is detected, you will want to clean the infected files, not delete them. Deleting the infected files could cause serious problems with your system. After you have cleaned those files, the programs that were infected will most likely need to be re-installed in order for them to work properly. If your virus detection software is not able to detect or clean the infected files, or if you do not have any virus detection software, then please try a virus scanner listed below:

http://security1.norton.com/us/home.asp?
Leprechaun Software

REINSTALL GAME: In order to restore the original game data files, we recommend that you fully reinstall and patch the game before trying to log onto Battle.net again. You may wish to back up your saved games to another directory before uninstalling the game. Now reinstall the game and download the patch from Blizzard Support.

Now you should be able to log into Battle.net again. If the "unable to identify application version" error happens again, this indicates that the game data is continuing to be altered and a virus may still be present on your system. You may need to contact your system manufacturer or your local computer technician for additional help cleaning the system.