Pages not Displaying Completely or 404 error

Earlier tonight I installed three plugins – one was SD-meeting, the second was meeting-scheduler-by-vcita.3.2.0 and the third banckle-online-meeting.1.2.

SD meeting had no clear directions and it apparently has about six plugins. On the third try I found the correct one to install first. The first two attempts caused fatal errors. Once I was able to install the correct plugin first, I was able to see it along the left nav panel with the other plugins that were activated. When I activated the second model for the SD plugin, I lost the ability to “see” the icon for this plugin to access the settings.

I deactivated it and then deleted all three plugins.

While my home page comes up without a problem and users can log in, other pages are not displaying properly. I either get a 404 error, or the background and nav bar are displayed, but nothing else – not the page or the tool bar. It seems that if I wait long enough the 404 error goes away but the pages still do not display. I deleted the .htaccess file but that didn’t help.

This is a production site and the server is not ours. It is hosted. Any help would be greatly appreciated.