From NT 4.0 merely unzip it to a folder =>Control Panel=>Multimedia=>Device tab=>[add]=>Unlisted or Updated Driver=>browse to driver folder=>[oK]=>CrystalWare Audio Driver=>[OK]=>NT may report already exist- CHOOSE [NEW]=> Crystal Codec cfg window comes up. choose [ok] & reboot. This should be all that is needed. If u discover irq/io conflicts, use NT diagnostics to resolve. There is a DOC file of TREMENDOUS help if any problems.