Arno has a good point and you should cut and paste onto the desktop of your computer in case you need it later although you should already have a copy in your Tom Tom folder in My Documents. Regardless, close Home and the click on My Computer, click on Tom Tom and look for the USA_Canada_Mexico folder. Right click and look at properties to makse sure it is the right folder, should be around1500-1600 MBs, then cut and paste to desktop or if you already have a copy in your Tom Tom folder delete it. Go back and open Home and see how much free space you now have and try and install from the "Install from my computer" tab.