I hate to appear negative, but please do yourself a favour and throw that speedtouch into the rubbish bin. I used to have one - not the 330, the earlier model: it needed firmware to be uploaded each time it was booted before it would do anything (and I think yours probably needs this too). It took me a week to get working, and I had to start all over again whenever I moved distros, or upgraded. It is a useless piece of junk.
Then go & get yourself an all-in-one DSL modem / Firewall / router / switch that uses ethernet to connect to your PC. I got a Zoom X5, but there are all sorts out there and they are easy to set up, usually with a web-browser interface. It connects faultlessly, has a safe firewall set as default, and runs my network. Once it is set up (2mins), you can just forget about it. When I install another distro, the new distro "just finds" the internet on eth0 and I am off. I have never looked back.