i recently had to reformat my reconditioned dell desktop after a virus. i was given a copy of a microsoft reinstall disc from the store where i bought the computer, after i ran the reformat, the computer worked great, except that there was no audio. i tried to download driver updates from the dell site, still no audio.the computer does not recognize any audio devices since i reformatted it. any advice? i tried a bunch of options. is there a separate audio disc i can get to reinstall the connection?