Download the free guide below. There are three formats, all are zipped as a lot of ISPS will not pass anything to their customers that may potentially damage their computers. If you want the PDF file you will need Adobe Acrobat reader to open it which you can get free just by googling for it. It's always a useful tool to have on your PC anyway. Not quite sure which one?? Go for the RTF file, it will open in practically any text editor.