Currupted client?

[LordSonoro]

I login, but when I try to choose a character, it pops up a message saying my client has been illegally manipulated, then returns my to the server select.
I honestly have not done anything, so I don't know why this has happened.
Anyway, my question is, if I reinstall the client, will my accounts be deleted?

[Nenova]

You can always safely uninstall and reinstall. Your accounts are not saved on your own computer, you can log in anywhere.

So yes, i would advise you to reinstall :)