What does Intel proset wireless do anyway?

I deleted it and my computer still runs wireless fine.. So what is the advantage of it...? Should I even reinstall it? Also I have a terrible time maintaing 54.00mps. My computer starts for the first 5 minutes at 54.00mps and then drops to 24.00mps. Keep in mind I am 6 feet away from the wireless access point. I get excellent connection as well. What can I do to keep it 54.00mps, because something is clearly wrong.