To me that's not "wireless." Try the Bluetooth pairing next (2.4GHz)
I recently bought a Rapoo E9090P wireless keyboard. The first time I connected the keyboard to my Dell XPS 8300 it worked. But as I wanted to download the software to edit the touchpad gestures I disconnected the keyboard. Now it won't work anymore and I am clueless. I also use a Trust wireless mouse but they dont seem to interfere because the keyboard worked.