When I try to run disk defrag, I keep getting messages that something is writing to the disk that is causing defrag to have to start over. I have have looked for something running in the background that might be causing this. I start defrag immediately after a reboot so there are no other windows open. I have looked in msconfig and the one click of cntl-alt-del but didn't find anything that jumped out at me. I'm not sure what I'm looking for anyway. Any suggestions as to what it might be and where to look and correct this problem.