OK for all you needs to know.
Connect the HDMI cable to the Laptop and the TV. Make sure the TV was OFF then Power it on so that the TV will then SEE the HDMI connection.
On the Laptop go to Start > Control Panel > Sounds > Right click on the "Digital Output Device" and set it as default. Depending on your Laptop will make the difference as to the name the HDMI device is under.
THIS IS the catch 22... some Laptop require you restart them after you save the changes, lol....
So while the HDMI cable is STILL plugged in and connected to the TV >>> restart <<< your PC.
Oh and something funny about Microsoft, sometimes you have to play sound in Windows Media CENTER before it will play sound through Windows Media Player.
If that fails... CALL YOUR LAPTOP MAKER, They have Tech Support for a reason