If you purchased windows 7 from a store, return it and get a new copy. If you downloaded it illegally, shell out the money and pay for it. As far as your drivers go, if you own a custom built system you will have to go to the manufacturer's website of either you motherboard or your sound-card if you have a sound-card. If you have a pre-built system then visit their manufacturer's website. ie. dell.com hp.com etc.