after you put a new card in a machine, you need to go to BIOS and reset it to defaults and reconfigure or update the BIOS. This will make the BIOS rescan the hardware and rebuild a database of settings that it sends to winodows. Otherwise, windows will detect the new hardware and install it but the BIOS and windows may have different settings and that can cause various bugchecks.
you might also need to apply new drivers and disable any onboard sound card or the sound support in your video card if you don't have speakers in your monitor that get its signal from the video card sound support.