Sony Vaio Audio Driver Doesn’t work?

So i just reformatted my notebook which is a Saty vaio model VGN-FE550G. I installed the Audio driver from the Saty site which is a Original – SigmaTel® High Definitiat Audio Device Driver but yet the audio still doesn’t work. Is there anyway i can get the audio to work?? I check in device manager and there isn’t a SigmaTel Driver that i see.
help please the last persat that gave me an answer was a stupid scamming site