which OS do you have? Try the bellow links steps:

http://www.kb.sony.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=http--esupportsonycom-perl-swu-downloadplupdid3166osid28templateid1regionid1SMBYESKSMFlag7370&sliceId=&docTypeID=DT_SOFTWARE_DRIVERS_1_1&dialogID=946630&stateId=1%200%20948279