The EPG requires a digital signal to work, but I've seen that it also needs a compatible operating system or the EPG won't work. For example, if you have a 32bit operating system and the software is for the 64bit, then EPG will refuse to work. I've also seen other users who complained about this error with EPG feature. The only way to overcome it is to install a compatible version of the software instead of the old one.
You can find the downloads on the following page: http://www.arcsoft.com/support/download-patch.html