Sci Fighter
A well-meaning genius creates a virtual reality game that leaves his grandson trapped within when a virus invades. The boy's father (Don Wilson) enters the virtual fighting game in order to combat the virus and save his son before they're both trapped forever.
Starring
Watch "Sci Fighter" on Amazon released in 2004. It's a science-fiction and action & adventure movie, and has a rating of 2.6 out of 10 from Imdb which is fairly low for this kind of movie, and is currently only available for purchase or rent.