Please first hook up your network card to the wireless router by an ethernet cable (also well-known as a LAN cable).
In order to collect essential troubleshooting details on your wireless card, please follow this process:
Step 1: Open Terminal from "Applications->Accessories->Terminal"
Step 2: Please copy-paste the subsequent command in Firefox into the Linux Terminal. Do NOT copy-paste from the Email message into the Terminal, as that will only copy PART of the command. The command STARTS with the remark sudo as well as ENDS with the word restart. So please copy-paste the ENTIRE command under from Firefox into a Terminal, and after that press the enter key, and after that type in your password when sudo asks for password, then press enter key one more time.
Step 3: Please post results (copy/paste terminal output) on this thread