The time is 2011 and the kids are using the internet and the computers more than ever. I suggest that it is time, just in time, to get those computers in tip top shape and don't let "The computer ate my homework" excuse hit the teacher's desk in September! Over the summer computers can have some tough times. Being used all day everyday, being abused everyday. Kids (and Adults) spill drinks on keyboards, drop the laptop off the bed, and can do things that are not even explainable.
Don't chance it and have them come to you the night before a big project and ask to use your computer, get the computers ready for the school year.