NovTek

In order to do a defrag properly, is it really necessary to reinstall windows? This should be a much simpler answer. So, I ask the question again and hope someone out there can prove their expert knowledge and show just how simple the answer is. What is it and why does autochk.exe act like it was canceled every time it is started at boot automatically by the dirty bit. I have done the CHKNTFS /D and registry entries but somewhere there must a switch or setting that tells the autochk that a keyboard cancel has been initiated. The two questions before this thread are 1) What is it? and 2) How do I change it?