Hello,
Check on the compatability of your wireless adapter with your computer. The 5423 uses 802.11 G, not N, so your laoptop or other wireless unit has to be configured for G to work. Also the included driver is for XP or earlier. If you have Vista, you have to download the Vista driver. Win-7 should also work with the Vista driver, but USR doesn't specifically say it is Win-7 compatable.