hi guys, i have installed a usb wireless adapter to my desktop. from that moment the wireless network icon will appear and disappear at the task bar. if i check the device management and take the property of the wireless adapter first it will show "the device is working properly" , then " there is no driver installed for this device"... this is happening in seconds. the wireless adapter realtek rtl8197 made by alfa. i tried with another adapter which is also showing the same thing. my system is amd sempron3000, with 1gb memory. operating system is windows xp. what could be the problem? xp or board.