Please Help!

[Part On!]

Hi All,
I just got back from doing karaoke night, and I'm having what seems to be a problem with the sound card. I have a hoster rack pc (1 year old), and during some of the songs I play, the speakers will sound as if they're blown. I know it's not my jbl g2's, because I can play cd's just fine....It seems that a reboot will temporarily fix the problem, but, it seems to come back again.
Again, I really believe it must be the sound card since I can play cd's just fine, it's just my pc applications (hoster and otsdj) that are giving me trouble.
Do you think I need to update the drivers? if so, where do I get them? any help you can give me will be greatly appreciated since I have another gig this coming Saturday.
Thanks,
John