Ok, I reinstalled Litespeed, now I enabled php from the beginning and now some things work, some things don't. For example, it loads php 5.3.6 that I compiled from the last time (I now that because it uses directories I said to use for configuration files). But it doesn't start my vBulletin forum. And also reports too many vhosts.
The problem, at least in some respect was not installing PHP from the start.