There's a Halloween party (Or a costume party at least) going on at the protagonist's(?) house. I'm pretty sure the main villain is the house's desktop computer, or a virus that's on it. I think it wants to control the people? At one point, people from the party are lured into a room that has a sign on it saying "Free beer" but inside the room, the guests of the party are unconcious and hooked up to something, while still in their costumes. I only have a very vague memory of this movie from when I watched it when I was little (I'm only 19 and i have no clue if it was new at the time.) It wasn't a very good movie, never became popular.
Thanks for the help!