Neither antivirus, nor RGB. But sort of found what's wrong. Tried every USB port: 3 on the front, 8 on the back - none of them works with the screen. But after that, I plugged the screen into one of the USB-hub ports(USB-hub is connected to one of USB's on the back) and tried to run the software. At first, an error occured("Device disconnected") and the screen partially loaded the selected theme. After clicking "Run" for a couple of times, the screen properly loaded the theme and starts receiving info from the software.
Probably something to do with USB drivers or something. I'll take a closer look at it and post a solution here, if I find one. Thank you for your help, emperg.