fatal error

the plugins of my website crashed since last week. Each time someone visit, only the theme will display. After that, it will display fatal error.

My engineers have tried to fix it especially the link before the whole site finally crashed last 2 days. Now we have decided to removed the plugins completely and download another one. But the question is, if we download another one, are we not going to lost the database that we have on the previous one?

What do you think we should do to put everything up and running?

Thanks.