how to install sound drivers windows 7

1:22

1:18

1:14

1:32

1:25

1:37

3:46

6:42

16:27

3:38

10:19

11:54

10:40

8:15

2:53

8:38

1:23

27:36

2:12

3:45

5:08

20:15

30:56

11:03

17:40

5:57

9:39

1:16

1:34

1:22

7:51

2:45

6:10

3:58

9:09

7:03

5:37

2:35

1:48