How do I fix broken wdm?

[Taro Fukunaga]

I broke wdm. It won't let me log in and i think its because of missing 
configuration files. Neither will xdm. i've tried to uninstall wdm, but 
I can't do that either when I issue the command dpkg --purge wdm. What 
can I do to fix this? I've tried to get the files from the source, but I 
have to build these to get the configuration files and I'm having 
trouble compiling it. XFree86-3.3.6 is working fine.

Thanks,

Taro