Steve,
That would vary with usage. Windows is a messy O.S. and tends to string stuff all over. I defrag this computer nearly every day, but I use it a lot more than the other one, which I do about three times a week. And, yes the more often you defrag, the faster it will go as there won't be so many scattered files that it has to move out into an unused area of the disk to put together and them put them back. And I run the disk cleaner that is on the page where you find defrag too. It will pick up some things, but is not a great tool. Just make sure you have whatever you want it to clean checked. I leave my trash bin unchecked as I don't want it taking out anything I have in there. When I am sure I won't need whatever I have in the trash bin, I empty it by clicking on it and telling it to delete the files.
Ron
