Try getting new driver's of FTDi for Windows 7 from the official FTDi site, or Open>Device Manager> then plug in or plug out your deumilanove in and out then the device that vanishes when you plug out the deumilanove is your deumilanove click on it to open the context menu and then select update drive from there and route to the directory of FTDi drives or the driver you recently downloaded from FTDi's website for FT232RL connection.