Installing ndiswrapper tools without ubuntu live cd / network issue

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http://askubuntu.com – I'm pretty new to ubuntu and would like to install a wifi dongle. To do this I need ndiswrapper. Unfortunately I can't seem to be able to download and install the tools without having an ubuntu installation disk. I installed ubuntu using a usb flash drive rather than a disk so I don't own a live cd. How can I install these tools without having the disk? I do have internet through cabled network. The main problem is that my built in wifi card is a lot less powerful when I boot ubuntu (the range is about 1 meter) while I have full connection on the windows side of my computer. Pleas help me t (HowTos)