Inspiron N5051 no Wifi + Dell System Detect does not work on Windows 7 64bit

Hi, I've just reformatted my Inspiron N5010 laptop, reinstalled WIndows 7 and now my Wifi doesnt work. Been trolling through the web I believe the issue here is with the driver as the attachment in Device Manager. I tried clicking on Software Update but it could not find the anything online. I tried to use Dell System Detect but it says format issue until I found a post in this forum stating to install Microsoft Net Framework. Title of post is Dell System Detect (DSD) launch error. It seems to have installed but when I run DSD nothing pops up. I was hoping DSD can help me identify the right driver. Can someone please help me with DSD, or maybe help me identify the right driver required? I hope I'm on the right track to resolve the WIfi issue.