Need driver for my wireless

I installed a wireless driver off of dell, but I think I got the wrong one, cause browsing the internet is really slow (scrolling, with IE or Opera can go up to 98% of the CPU, and goes really slow).  Nothing else on the computer is slow.

 

I have a Dell 600m.         Model WM3A2100       Dell Pin: OU2027

 

What driver do I need?