The default error pages has been updated in latest build of 4.2.9, just do a force reinstall, should looks better.
We will add the feature to allow people customize the default error page, maybe in our 5.0 release.
I use Apache so why is there an error page linking to litespeed on the top of all my website pages? Please tell me how to remove this virus. Some one in your company is hacking wordpress based websites to place error page header with links to you. Please stop this practise and tell me how to remove this virus. Thank you.