I can't speak to Windows 8.1, but I have Windows 7 64-bit and have found success using VMware Player with Windows XP (32-bit) as the guest OS. I imagine you could also use Windows 7 32-bit as the guest, but I haven't tried that under VMware (it does work stand-alone on 32-bit hardware). I have successfully used both PENG and PPENG, with TSU-3000 and TSU 7000/7500. One must install the editor with the docking station/remote disconnected. After connecting the remote, the USB port will be recognized. I don't know what TSU (US) model is equivalent to the RU990 -- you might have to search for and install a USB driver, as you would have to do for the 7000/7500.