Bugs in Defraggler in Defraggler Bug Reporting Posted February 25, 2016 I installed Defraggler 2.20 on my other computer (a laptop running Windows 7 SP1 with all updates). The installer crashed, and I got the message that Windows was looking for a sollution for the problem. The next time around it DID install Defraggler without any errors displayed. When I ran it, it went very slow (as it did on my desktop) and I did NOT trust it anymore, so I went back to version 2.19, which installed fine and ran fluidly. I really do not trust Defraggler 2.20 anymore.. There is really something wrong with it.. You say that it is not possible that Defraggler can cause bad sectors. But when I ran 2.19 I had no problem what so ever. It ran smoothly. Installed 2.20 on my desktop (and laptop 2 days ago) and it ran very slow. and I got bad sectors. There IS something wrong with this version. I await version 2.21, and see how goed that one installs, and how fast or slow that program runs. If it is really slow, there is really something wrong with it. ---+--- I ALWAYS deactivate my virusscanner (Avira free) before running Defraggler. So that can not be the cause of Defraggler 2.20 running way out slower than version 2.19. And really, as my laptop (the other computer) gets error messages because it can not install correctly, than there is something wrong with the program.