A New Hampshire school district's website was shut down this week by a "worm" computer virus. As officials looked into the issue, they said staff at the middle and high schools could not access files, while it appeared that elementary schools and students' records were not affected. "A worm like this just weaves its way through the service," said Michael Delahanty, superintendent of School Administrative Unit 57. "It could have come from a number of different portals. But what it really comes down to is our need to take a closer look at our current level of protection."