According to several internet sources, some Sony sites, including incidentally eqplayers and wherever the launchpad gets its files from, have been brought down by a concentrated denial of service attack by Anonymous.
So you cannot browse eqplayers or the related forums, and if your installation for whatever reason needs to update the launchpad, it fails. With no access to the relevant sites, you cannot fix it by re-installing the launchpad, it just says "oops... internal error on our servers".
Our family had one machine that broke and a couple others that could log into the game fine. At first, just to allow the person using the broken installation to play for raids, I used the patchme trick. You need to execute EQGAME.EXE with a parameter "patchme". I did it the way that seemed easiest to me, opening a DOS command window, changing to the everquest folder, and typing the line:
Ymmv, you could set up a shortcut to do the same.
Note that you are NOT executing everquest.exe... that may fail in various ways.
Then, after raids were over I copied all the launchpad files from a working machine to the broken one. Note that there are a few files in the everquest main directory with names starting with launchpad, and also a new subdirectory tree launchpad.libs that probably also needs to be copied.
After that, the broken machine works normally. If they do not get the sites fixed and they try to push a patch things may break for everyone though.