XP pro no longer regocnizes sound device after Ubuntu 7.10 dual boot. How do I fix it so I have sound in XP as well as Ubuntu?

Hi, I have a DELL dimmension 3000 that came with XP home SP2. I went to Ubuntu after years of XP. I backed up my music and movies on a Seagate external Hard drive and it does not recognize it. So I went back and installed a copy of XP pro my friend let me use because I don't have the reintallation disk for my computer. I reloaded XP pro and I no longer have sound. I am using the integrated sound device that my computer came with. I went to the device manager and it says I do not have a mixer device in my system. I can't even access my system volume becuase it says I don't have a sound mixer in my computer. When I try and play music it says my sound device might be being used my another program. Then, I switched back to Ubuntu and dual booted with XP pro and the sound works fine ON UBUNTU not XP How do I get my intergrated sound card to work with XP pro?

I already went into bios and messed with the sound and nothing works. I need help!!