Without a description of the problem it is difficult to help you. However, for the National Teams Art to install you need to satisfy three things:
1. You need to have EAZip installed in your main NBA Live folder (For example C:\Program Files\EA SPORTS\NBA Live 2003\).
2. You need to have CDBFlite installed in your main NBA Live folder (For example C:\Program Files\EA SPORTS\NBA Live 2003\).
3. You need to have the National Teams roster installed in the saves\015 directory (For example C:\My Documents\NBA Live 2003\saves\015\).
You can get all these items at:
nteams.nbalive.org
If you satisfy those three criteria then the patch should install properly.
Do you use Windows ME? Some users have had problems installing the patch under Win ME because Win ME doesn't allocate enough memory to run the batch installation file. I have an National Teams Art installation fix that solves the Windows ME problem if you need it...
NOTE: CDBFlite is still required for the installation of the National Teams Art V1.0...however all other National Teams patches utilize MDBF instead...