New dell; couple of problems

I recently bought a Dell (lol); after a couple days use, I get a horrible screeching noise anytime anything makes a sound (music, video, etc). Any way to fix this? I've looked for new drivers for teh card, but I've found nothing. :\

Also, for some strange reason, my cable connection seems to be capped at 242kbps down and 34 up. Any way to remove this stupid cap? I've fiddled with the network card's settings to no avail.

HALP :(

>>3
In that case, what brand of PCI sound card do you recommend? I'm afraid I don't know too much about them. :/