Probably. That's X Font server.
If you can turn those back on, you'll be okay. The way I used to do it, way back before I knew how to type startx, was I'd put in my installer disc, not touch the partition schemes, wouldn't format anything, but install 1 small package. This gives you some extra options after that, and 1 of them might be what services to start. If it doesn't, click the bubble next to the option, it should bring up the screen for it. Click on XFS, and maybe portmap (this sounds important?) and click ok.
Then finish your installer, and go from there.
As far as vim saying you can't do something, it should only say that if you aren't root, and to modify such vital files, you'd have to be root.