Audigy manufacturers the Sound Blaster line of sound cars. It's similar to how Honda makes the Accord line of cars.

Three Creative Labs that have HD audio are: Creative Labs SB0570L4 Sound Blaster Audigy SE Sound Card,Creative Labs Soundblaster Audigy SE 4L PCI Sound Card, and the Creative Labs 70SB104000000 Sound Blaster X-Fi Xtreme Audio Sound.

Yes they are. Most of them are compatible some of them just need drivers. Creative Labs Sound Blaster Audigy SE PCI Sound Card is compatible.

So long as your Dell has a free PCI port, that sound card should work perfectly fine.

When I try to down load the drivers to my Sound Blaster Audigy 2 ZS i get an error code

28 and the drivers will not download. The drivers are for the Multimedia Audio Controller.