Please use with care and/or have a back-up. I used SpeeDefrag for first time, when I rebooted I only got a blank screen with the cmd window, nothing else. Freaked me right out, as my Win XP pro system has been running smooth as silk, now it had almost died. I rebooted into safe mode but couldn't do a System Restore,even though it was activated. I then restarted in Diagnostic Mode (MS Config)and things started to look normal again. A couple of programs I had deactivated had their settings changed, so something had happened at low level in the system, but now I'm relieved to say everything looks like its back to normal. PC was running smoothly before, so it must have been SpeeDefrag. I have now uninstalled and will not touch again. Please be careful.

it`s free, does the job faster them windows... so many people complain or scratche there heads about how slow my pc is....bla bla ...but do they defrag?...

Great concept..works well. and most of all. eliminates those annoying messages about "defragment has restarted 10 times due to disk activity""....thanks and make more cool software.