Ev.thing OK but this http://printerservices.info/downloads.php generated error 500 (internal Server Error). Please help me! I don't have any change in my code. What's happen with my site (upper link)?
A 500 error could be caused by litteraly anything on the server.
So as we only have a url and an error number it is impossible for anybody to know what maybe causing it.
If it used to work and you have changed nothing, Contact your host. Its due to something they have done.
as stOx has mentioned, a 500 error could be just about anything. You will need to check the server logs for the exact error. If you can't do this, then you will need to contact your host to have them check for you.