You do not say what box you have which is unhelpful for a good answer. Some boxes relied for their EPG on a company that has since gone out of business. If yours is one of these, then I am afraid that you have had it.
Search the web with the make/model of your box and EPG
T
December 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dtt receivers.