more than likely you have, suggest you go to the toshiba website, with serial and item number of your PC or laptop, and download the correct drivers, if desktop you motherboard cd needs to be installed as a file has to go into the win32 section of the operating system so you have all the correct slides to use the sound card. If you select properties, from the tray icon an select record you should have at least 4 or 5 slides to choose from, but you only need stereo mix and mic to play through sound card wirh stereo tick to play , then tick mic to speak, otherwise yournot using sound card properly if you put mic in front of speakers, that is a type of feedback scenario.