Installed Windows XP, no sound driver.

Recently I got a virus that apparently corrupted Windows Vista. It wouldn't boot up at all. I installed Windows XP Pro and now I have no audio drivers. When I go to Sounds and Audio Devices in the control panel, it says no audio device, and in the audio tab, it says there's no playback device and I can't click it cause it's gray'd out. I've tried pretty much EVERYTHING, I've downloaded tons of drivers. I've installed the drivers, rebooted, everything. Please help.