You find the right place of firmware version but what you provided is not right. http://www.tp-link.com/en/faq-315.html Upgrade the latest firmware(150105)....

Operating system of your desktop? What's the IP address obtained, 169.254...? Did you try static IP?

It disconnects during normal use? How does it work again? Check status of wireless network connection. Did you try different USB ports or different computers to install it?

when i check the Device Manager the it didn't success, the computer didn't recognize the adapter Can you provide some screenshots to illustrate the problem? I have much trouble understanding the...

the installation worked but the adapter still didn't work The driver has been installed successfully? http://www.tp-link.com/en/faq-284.html It didn't work, which means that you cannot detect Wi-Fi...

Very good idea but we have to install printer controller utility on PC and printer driver has to be installed before that.