Windows vista ultimate doesn't recognize my labtec lcs 2424 speakers but it does my sound card

Being windows vista is most likely is a driver problem. Is it internal or external sound system, not the card that works. If the manufacturer does not have an updated driver by now you can set the device to work like windows xp and it should only effect that device. Also search the web there are driver packs out there for windows vista, keep in mind its all the drivers for everything on one large compressed file so it should be a large file size.

Ultimately I would say upgrade to windows 7, its how windows vista should have worked. I have devices from windows 98 that work on win7 no problems. Vista was just very premature in its release. Hope this can help. Sorry for my bad spelling.