Maybe this will help someone in advance.
We have a website called World School Of Prophecy & News Events at wsopne.org or should I say had. We have some issues from day of one of this web site, one of them being AT&T web hosting, not supporting any WP version over 2.83.
We worked on search engine optimization constantly and because we had a large site 140 + we were working on Page speed and trying to find a better cache plug-in. We were in the # 1 rank on first page search of Google in over 40 categories.
About 27 hours on 9/5/10 ago We installed "W 3 Cache Plugin" and fatal error, so I uninstalled it, then could not get back into my dashboard, getting an error say that all the files did not uninstall. So i went in manually and and worked on it.
Not knowing what the problem was, we finally reinstalled WP 3.01........Then that started all kinds of new issues, now our data base won't connect, passwords wont match, user name issues, I have to have a certain user name with AT&T and admin with WP, and wp keeps resting the password........i AM CAUGHT IN THE MIDDLE. Our site has been down 30 hours, and because we have over a thousand url's we are generating 404's in a record way...LOL, I don't have to tell what that does to your search ranking.
So i guess we have lost it all.
TIP For Designers
Oh and by the way we found after the fact....the files that caused the original problem that did not uninstall from "W3 Cache Plug-in' was db.php & cache.php, if we had known this, we could have avoided this whole thing.........
Tired and Heart Broken