Some Parental control software will allow you to create a block list or restrict access based on site ratings, I believe IE7 has minimal parental control built in, but never used it and He could always install FireFox..
thanks for the help. . I am using fox filter to block sites. . but he still manages to download through other sites. . is there a tool or a way to block certain file formats? Another thing . . If i use put the guest user will it even help stop the downloads?