it's a long story... firstly, you may refer to the following link to check whether the driver is installed successfully or not. http://www.tp-link.com/en/article/?faqid=284 then, if it's working...

it seems that it can't support WEP security...

You may try the following link: http://www.tp-link.com/en/article/?faqid=306

when you disconnect wifi, please refer to the following link to check whether the driver is working or not.: http://www.tp-link.com/en/article/?faqid=284 If it's working properly, you may try to set...

It seems like it can't make it without PC. TL-WA901ND has no DHCP function, so the only way to login to the setup page is to set up static ip for local area connection on computer and connect PC to...

disable wireless network connection on the computer before you set static IP on it. it can avoid ip conflicts when you try to login to the setup page.