I would say your XWindows (and icons) are huge because you're using a very low resolution and you have a virtual desktop bigger than the physical screen. Run xf86config (from command line) and choose better options.
For the networking card, I would be surprised if there are any drivers installed for it at the moment. I have a similar card, the linksys WUSB11, and I needed to download drivers to get it working. Go to: http://atmelwlandriver.sourceforge.net
untar it, run make config, then make all, then make install.