Installing USR 5422 on Ubuntu 12.04

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http://unix.stackexchange.com – I am a newbie to Linux. I was trying to set up the USR5422 USB adapter. It worked fine for the first time, but since then it freezes the computer most of the time. What commands can I fire to see what's going on? Thanks. I followed the instructions on http://ubuntuforums.org/showthread.php?t=781337 Update: It's stopped freezing, but is unable to connect to the wireless network. My network authentication has the following properties Security type : WPA-Personal Encryption type : TKIP I've got the following settings in the linux laptop Security : WPA & WPA2 Personal (HowTos)