@MedineAmouk,

Try to use the drivers that are available for download from the support site as there have been a few updates for the device. When the original T4U was released, there was a documented behavior that is somewhat similar that was fixed in an update. It is possible that the driver you are using is outdated.

Something that can often trip people up is that there are compatibilities that exist between your motherboard and adapter, please make an effort to update your motherboard and PC to the latest version, as some devices have needed updates to accommodate newer technologies such as 5Ghz. 

Lastly, try uninstalling, restarting the PC, plugging the adapter in, and then restarting again. This will allow your PC to check what devices are currently connected.