Rerun the install script will erase everything?

,

I’m trying to fix a MAJOR problem I have (See Here: Php update error). I can not fix this on my own and it seems like no one else can (at least as fast as I need it fixed, next week). I might have to take the cheap route. If I redo the install script will it erase all of my documents, calendars, etc or will it actually repair it?