i recently installed a sound-blaster sound card that i bought secondhand. It came with no software, but windows automatically found my drivers and installed them. All works perfectly until i switch off the computer. When it restarts i have no sound and some of the settings are changed. This only happens if the computer is completely switched off or re-started. The only way i can get sound to come back is to un-install the drivers, re-boot the pc and let windows re-install the drivers!!