blacknemesist :
You can check that by going in the control panel -> hardware and check if and Usb port have a ! next to them or if any interface device is shown as "unidentified".
I presume you have razer synapse installed?
I waited a bit and simply reconnected the mouse until he was finally recognized. It happened a long time ago but it was probably due to some conflict or bad usb drivers.
I'll give it a search to see if that is a common problem.
( one quick search later )
Apparently some versions of synapse caused alot of problems for some people. I recommend that you unistall it completely, restart the computer and see if it works. If you are not using synapse then install the latest version and reboot. I'll keep looking.
According to the control panel, the mouse is not detected. I had synapse but I uninstalled it to see if it would fix the problem but it did not. Ill install synapse, reboot then plug the mouse in to see if that will solve the problem, I will update later. Last question, it's a long shot but could it be possible that the usb port is not supplying enough power?