I'm new to wireless, so bear with a newbie. I have the combo above, and I'm seeing big variations in speed, even when the router is close to the computer and with 100% signal. The status display on the router fluctuates from 270 to 54, mostly near the 54 end. I have no other wireless devices (yet), and no cell phones operating at the time. I'm also seeing dropped connections from time to time. I'm running Vista HP 32. Do I have a defective component? How do I tell which is the problem?