EndItAll works great and is free

There is a free program at http://www.pcmag.com/article/0,2997,s%253D1478%2526a%253D10165,00.asp called EndItAll that will do this for you and is highly recommended...the pcmag link is to version 2 and is more complicated to configure for a newbie than Version 1 listed below)

EnditAll Version 1
http://www.genealogy.net.nz/id12.htm
http://www.compu-docs.com/links.htm
http://www.asktcl.com/free.htm

And also choose NONE for a screensaver until Scandisk and Defrag have been run successfully.

TONI