Hello, I'm using an xxxxxx kit and have the USB to dual-virtual com port software running on the LPC2148. The host driver (PLP2KUS.inf) works perfectly on Windows XP, but unfortunately my laptop has Vista 64 bit and it won't accept any of the drivers i found. I already disabled the digital certificate control on the OS(vista x64 won't let u install drivers with no digital signature)so that shoudn't be the problem. I tried to install drivers for xp/2k, tried to modify them with info found on the internet, modified them with the include=mdmcpq.inf found on this forum, asked your distributor (Tecnologix, Italy) for the latest upgrades but still Vista cannot install drivers and i see the Hardware as a double PHILIPS LPC2148 VCOM icon in Hardware management prompt. Any suggestions??? Thank you in advance for help