Apt-get question

I screwed up my xfree86 config file far beyond repair. What is the apt-get
command to remove all traces of x so that I reinstall it from scratch? (I have
been fighting with x cause I am trying to get it work on a laptop and it is
recoginising the chipset, but gives me "no screens found".

I have tried:
apt-get --purge remove x-window-system
apt-get install x-window-system
and it does not pop me insto the config program...