[CentOS] Migration from FC3 to Centos4.4 gives problems with Samba

Hi

I have updated one of my servers from Fedora Core 3 to Centos. All
services run fine except Samba. The Centos installation is fresh and I
setup Samba in a similar way as I did before with Fedora. I copied the
samba password file from the Fedora installation and also all
user+machine accounts to the /etc/passwd|shadow etc.

Problem I now have is that clients cannot find their server profiles
when they try to logon (bath owner rights, or profile is unavailable).
After some trial I found out that I can solve this issue by removing the
XP client computer form the domain and then adding the client computer
again. So it looks to me that the client machine is not seen properly by
Samba. Is there a way to copy information from the old installation to
the new Centos installation so that I don't have to re-join every
individual computer to the domain again? Or is there a way I can do this
with Samba?

Thanks for any help or suggestions.
Theo