The TP-LINK N600 is an affordable dual band USB adapter, which offers decent performance, a quite good coverage and supports Wi-Fi Protected Setup. As a bundle the manufacturer also offers an USB extension cable and an easy to use software for the Windows operating system."
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips