No defrag required and if your filesystem detects corruption it scans automatically, it's not Windows so you'll need to take off your Windows hat and put on a Linux one
From the top - check to make sure your hardware is supported at http://www.linux-drivers.org/
Canon printer drivers from Canon which will probably include their tools can be downloaded here: http://software.canon-europe.com/sof...336.asp?model=
That Netcomm router has USB or Network (RJ45) connection. Connect to your PC via Network port and it should work out of the box if you've preconfigured the ADSL when it was attached in Windows?
What's the Logitech camera? There's lots of them about and most are supported.