I have a computer HP 620 with Microsoft Windows 7 SP1 32 bit. The wireless card is a Ralink RT3090 802.11/b/g/n wifi adapter (Hardware ID : PCI\VEN_1814&DEV_3090&SUBSYS_1453103C). The problem is that the wireless card detects the networks (WPA PSK2) but once I enter the password, I get the (unable to connect) error. The network works correctly with other devices. I tried to reinstall the driver, but I still have the same problem. The weird thing is that I tried a USB wireless key and the pc was able to connect to the wireless networks but the built-in wifi adapter can not. What could be the problem and what should I try ? Does the wifi external SUB key working while the built-in ralink not working (detecting networks but not connecting) means that the ralink is either damaged or there is a software fault with the driver that can’t be solved.