Beast Within (2008)

aka Virus Undead

After his uncles death, Robert and two friends head to his uncle's mansion to settle the estate. The town sheriff is unfriendly, the local thug holds a grudge toward Robert, and Robert's ex-girlfriend is still upset with him for suddenly leaving town years ago without an explanation. However Robert's friend is able to convince her and another girl to come to the mansion that night for a party.

As the boys drive to the house, they see lots of dead birds by the side of the road. Robert's uncle was studying bird flu and once at the house they find a laboratory in the basement. This comes in handy later when the zombies start to attack. There is no explanation as to why all the zombies have come to this remote mansion location. There is also no explanation for how the group figures out it is a bird virus that is making everyone turn into zombies. I know they're medical students, but come on.

The group stays in the living room, which seems crazy since it has glass doors and tons of windows. Why not find a safer room in which to make a stand? Also one girl ends up jumping out the window and making a stand on her own on the front lawn. Why? It makes no sense. Plus as soon as she's out, the other two characters lock the window and roll down a window covering that looks like those metal safety doors you see over businesses. If they had that option to cover the windows, why didn't they do that before the zombies smashed the windows? And does the front door not lock? Zombies keep pushing it open. Good god.....