2
You need to re-install Xoops. Make sure you upload all the files to your server.
I checked your server.
under language/english/ directory
you should have 11 or 12 files. You only have one file in the directory
http://www.nexusw.zer0host.com/xoops/modules/system/
does not exist
All indicate incomplete upload. So try to reupload all files to your server and install again.
Make sure you change your database password once you are done. It is world readable now.