I am no computer expert but when I was looking ofr a new netbook I was told the window CE did not and could not have flash. As the point of CE is to be cheeper and less power hugry. You might be able to switch to using Linux. If the netbook can boot from a USB then go here
http://www.pendrivelinux.com/ and then you will be able to install linix to the USB and use it from the USB with out it changing the netbook untill you are ready. I managed to change from an older linux to a newer version which then allowed me to use itunes/spotify.
But I would find a real experct to advise you before you do anything drastic.