I've been thinking for a month now about this very old cartoon or even Japanese anime, in which there was a girl who had to go inside a PC to protect someone (the prod of that PC word?).
The story revolved around a girl, an “ex-fiancé” and two main digital entities. Of the latter, one is a god and the other one becomes bad (this last one took the form and appearance of that ex-fiancé).
At the end, it was revealed that the good entity that some day, just appeared in the girl's computer screen, was indeed send by the now evil entity.
That girl just materializes into the computer's world, and in my own opinion it was really co (the good entity was like a guardian of that world).
This is not Code Lyoko. I do remember having seen it during my first years at the elemtary school, so between 2000 and 2006-7. I’d really like to find it out! I remembered it because when I was younger I saw merely the last few episodes.